JP6619378B2 - Tracked tractor - Google Patents

Description

  The present invention relates to a crawler tractor for farm work provided with a pair of left and right traveling crawlers that support a traveling machine body, and more specifically, post-processing for removing particulate matter, nitrogen oxides, and the like contained in engine exhaust gas. The present invention relates to a crawler tractor including the device.

  Conventionally, when a steering part (cabin) is shared with a wheel-type tractor in a crawler tractor, the fuel tanks are distributed to the left and right using the space of the fender part formed on the left and right sides of the steering part. (See, for example, Patent Documents 1 to 3).

  Also, a diesel engine filter built-in case (hereinafter referred to as a DPF case) and a selective reduction catalyst are built in the exhaust path of the diesel engine as a post-processing device (which may be called an exhaust gas purification device). A technique for providing a case (hereinafter referred to as an SCR case) and introducing exhaust gas discharged from a diesel engine into both cases to perform purification treatment is already well known (see, for example, Patent Documents 4 and 5).

JP, 2006-215953, A JP-A-2015-148186 JP 2013-10480 A JP 2006-203753 A Japanese Patent Laying-Open No. 2006-74267

  When nitrogen oxides in exhaust gas are removed using the selective catalytic reduction (SCR) method, it is necessary to supply a reducing agent (for example, urea water). Therefore, when mounting the SCR denitration device on the crawler tractor, not only the SCR case but also the space for mounting the reducing agent tank is naturally required.

  This invention makes it a technical subject to provide the crawler tractor which considered the said present condition and gave improvement.

  The present invention relates to a traveling machine body equipped with an engine and a transmission case, a pair of left and right traveling crawlers supporting the traveling machine body, a post-processing device for purifying exhaust gas of the engine, and a reduction supplied to the post-processing device. In a crawler tractor including a reducing agent tank for storing the agent, a rear support that supports the rear side of the control unit of the traveling aircraft body is attached to a rear housing provided on the left and right outer surfaces of the transmission case, A pair of left and right fuel tanks are distributed and mounted on the left and right rear support bases so as to be accommodated in the fender part provided on the left right side part, and an extension base is provided on the front side of each rear support base. The reducing agent tank is mounted on one of the extension bases so as to be accommodated in the fender portion.

  In the crawler tractor according to the present invention, a reducing agent supply device that supplies a reducing agent in the reducing agent tank may be mounted on the extension base so as to be accommodated in the fender portion on the front side of the reducing agent tank.

  In the crawler tractor according to the present invention, the replenisher cylinder of the reducing agent tank protrudes obliquely upward and leftward and outwardly on the front side of the fender part, while the fuel tank of the fuel tank is obliquely upwardly and laterally outward on the rear side of the fender part The height of the supply cylinder may be set lower than that of the oil supply cylinder.

  In the crawler tractor of the present invention, each fender portion is covered with a fender cover, and the fender cover having the reducing agent tank has an opening window at a location corresponding to the supply cylinder and the oil supply cylinder, Each open window may be provided with a lid cover that can be opened and closed.

  According to the present invention, a traveling machine body equipped with an engine and a transmission case, a pair of left and right traveling crawlers supporting the traveling machine body, a post-processing device for purifying exhaust gas of the engine, and the post-processing device are supplied. In a crawler tractor including a reducing agent tank for storing a reducing agent, a rear support base that supports a rear side of the steering unit of the traveling machine body is attached to a rear housing provided on the left and right outer surfaces of the transmission case, and the steering unit A pair of left and right fuel tanks are distributed and mounted on the left and right rear support bases, and an extension base is provided on the front side of each of the rear support bases. Since the reducing agent tank is mounted on any one of the extension bases so as to be accommodated in the fender portion, it is formed on the left and right side portions of the control portion. By effectively utilizing the low rear high dead space before that serial fender portion, side by side and larger the fuel tank of small the reducing agent tank and the volume of the volume before and after can be arranged efficiently, thereby suppressing crawler tractor size.

It is a left view of a crawler tractor. It is a right view of a crawler tractor. It is a front view of a crawler tractor. It is a top view of a traveling body. It is a right enlarged side view which shows the state in a right fender part. It is a top view which shows the positional relationship of the fuel tank and urea water tank with respect to the transmission case for a straight drive. It is a perspective view which shows a urea water piping system.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings for a crawler tractor for farm work (hereinafter simply referred to as a tractor). As shown in FIGS. 1 to 3, the traveling machine body 2 of the tractor 1 is supported by a pair of left and right traveling crawlers 3 as traveling portions. A diesel engine 5 (hereinafter simply referred to as an engine) is mounted on the front of the traveling machine body 2, and the traveling crawler 3 is driven by the engine 5 so that the tractor 1 travels forward and backward. The engine 5 is covered with a bonnet 6. A cabin 7 as a control unit is installed on the upper surface of the traveling machine body 2. Inside the cabin 7, a steering seat 8 and a steering handle 9 for steering the traveling crawler 3 are arranged. On the left and right outer sides of the cabin 7, an upper step 10a on which an operator gets on and off is provided.

  Fender portions 21 that are recessed inwardly on the left and right sides are formed at the lower portions of the left and right sides of the cabin 7. For example, when the cabin 7 is mounted on a wheel type tractor, the upper side of the rear wheel is accommodated in each fender portion 21. In the left and right fender portions 21, fuel tanks 11 that supply fuel to the engine 5 are arranged separately. A battery 50 for power supply is mounted in front of the fuel tank 11 in the left fender portion 21. A urea water tank 51 (details will be described later) as a reducing agent tank is mounted in front of the fuel tank 11 in the right fender portion 21. The left and right fender portions 21 are each covered with a fender cover 26. The left and right fuel tanks 11, the battery 50, and the urea water tank 51 are hidden by the fender cover 26.

  As shown in FIG. 4, the traveling aircraft body 2 includes an engine frame 14 having a front bumper 12 and a turning mission case 13, and left and right aircraft frames 15 detachably fixed to a rear portion of the engine frame 14. . The axle 16 is rotatably projected outwardly from the left and right ends of the turning mission case 13, and axle cases 90 covering the axle 16 are provided on both the left and right sides of the turning mission case 13. Drive sprockets 62 are attached to the left and right ends of the turning mission case 13 via axles 16. The rear portion of the body frame 15 is connected to a straight transmission case 17 for appropriately shifting the rotational power from the engine 5 and transmitting it to the drive sprocket 62.

  A hydraulic lifting mechanism 22 that lifts and lowers a ground working machine (not shown) such as a rotary tiller is detachably attached to the rear portion of the straight traveling case 17. The ground work machine is connected to the rear part of the straight traveling mission case 17 via a three-point link mechanism including a pair of left and right lower links 23 and a top link 24. A PTO shaft 25 for transmitting a PTO driving force to a working machine such as a rotary tiller is provided on the rear side surface of the straight traveling mission case 17 so as to protrude rearward.

  As shown in FIGS. 1, 2, and 4, left and right track frames 61 are arranged on the lower surface side of the traveling machine body 2. The track frame 61 extends in the front-rear direction and is provided in a pair of left and right sides, and is positioned on both outer sides of the engine frame 14 and the body frame 15. The left and right track frames 61 are connected to the engine frame 14 and the body frame 15 by a lower frame 67 extending in the left-right direction. The front ends of the left and right track frames 61 are connected to axle cases 90 provided on both left and right sides of the turning mission case 13. On the outside of each of the left and right track frames 61, a lower step 10b on which an operator gets on and off is provided.

  The left and right central portions of the lower frame 67 are fixed to the rear side surface of the engine frame 14 via a connection bracket 72. The left and right ends of a beam frame 68 extending in the left-right direction are connected to the middle part of the left and right track frames 61 in the front-rear direction. Rear beams 73 projecting inward at the rear of the left and right track frames 61 are connected to rear housings 74 fixed to the left and right side surfaces of the straight traveling mission case 17 so that the rear part of the track frame 61 is connected to the left and right side surfaces of the transmission case 17. Fix it.

  The track frame 61 includes a drive sprocket 62 that transmits the power of the engine 5 to the traveling crawler 3, a tension roller 63 that maintains the tension of the traveling crawler 3, and a plurality of track rollers that hold the ground side of the traveling crawler 3 in a grounded state. 64 and an intermediate roller 65 that holds the non-grounding side of the traveling crawler 3. The driving sprocket 62 supports the front side of the traveling crawler 3, the tension roller 63 supports the rear side of the traveling crawler 3, the track roller 64 supports the grounding side of the traveling crawler 3, and the intermediate roller 65 supports the non-traveling crawler 3. Supports the ground side. The tension roller 63 is rotatably supported by a rear end of a tension frame 69 configured to be extendable and retractable rearward from the rear end of the track frame 61. The track roller 64 is rotatably supported on the front and back of an equalizer frame 71 supported on the lower part of the track frame 61 so as to be swingable back and forth.

  Further, a front dozer 80 can be mounted on the front portion of the tractor 1. A pair of left and right dozer brackets 81 are fixed to the front side surface of the engine frame 14, the axle case 90, and the lower frame 67, and a U-shaped (U-shaped) support arm 83 of the front dozer 80 in the plan view is The dozer bracket 81 is pivotally supported so as to be detachable on the outside (machine outside). The left and right dozer brackets 81 have a front end inside (machine inside) connected to the side surfaces of the left and right engine frames 14, a rear end lower side connected to the upper surface of a middle part of the lower frame 67, and a midway part in the middle of the axle case 90. It is connected so that it can be held up and down. The dozer bracket 81 is firmly fixed to the three of the engine frame 14, the axle case 90, and the lower frame 67, thereby ensuring the strength to withstand heavy work by the front dozer 80.

  The front dozer 80 includes a pair of left and right connecting frames 82 that are bolted to the outside (machine outside) of each of a pair of left and right dozer brackets 81, and rear left and right sides of a support arm 83 configured in a substantially U shape in plan view. The end is pivotally supported at the front lower part of the left and right connecting frames 82 so as to be rotatable up and down. A pair of left and right lifting cylinders 85 are interposed between the front upper portion of the left and right support frames 82 and the front end portions of the left and right upper surfaces of the support arm 83 so that the support arms 83 can be raised and lowered by extending and retracting the lifting cylinders 85.

  A blade 84 is attached to the front end side of the support arm 83 via a blade attachment body 88. The blade mounting body 88 is pivotally supported at the left and right center of the support arm 83 so as to be rotatable left and right. A blade 84 is tiltably supported on the front surface of the blade mounting body 88. An inclined cylinder 87 is interposed between the upper left and right central portions of the blade 84 and the left and right sides of the blade mounting body 88, and the blade 54 can be tilted by expansion and contraction of the inclined cylinder 87. A pair of left and right angle cylinders 86 are interposed between the left and right rear portions of the support arm 83 and the left and right sides of the blade mounting body 88. The left and right angle cylinders 86 are expanded and contracted in opposite directions to move the blade mounting body 88 left and right. It can be rotated. Thus, the blade 84 can be moved up and down, tilted forward and backward, and tilted up and down.

  As shown in FIGS. 2, 3, 6, and 7, in the exhaust path of the engine 5, a first case 31 (which may be referred to as a DPF case) and a second case 32 ( SCR case). The aftertreatment device removes particulate matter (soot, etc.), nitrogen oxides (NOx), etc. contained in the exhaust gas of the engine 5 and discharges the exhaust gas after purification to the outside. In the embodiment, an oxidation catalyst and a soot filter (not shown) are accommodated in the first case 31. In the second case 32, an SCR catalyst for reducing urea selective catalyst and an oxidation catalyst (not shown) are accommodated. The first case 31 is mounted on the upper portion of the engine 5 in a posture along the crankshaft direction (the front-rear direction in the embodiment). The second case 32 is disposed on the lower right side of the front portion of the cabin 7 in a vertical posture in which the exhaust gas is directed from the bottom to the top.

  The exhaust outlet side of the longitudinal purification outlet pipe 33 is connected to the exhaust outlet side of the first case 31. A vibration-absorbing bellows tube portion 34 is provided in the longitudinal middle portion of the purification outlet tube 33. The exhaust inlet side (upper end side) of the urea mixing pipe 35 is connected to the exhaust outlet side of the purification outlet pipe 33. The urea mixing pipe 35 has a substantially L shape that extends from the lower side to the upper side on the right front side of the cabin 7 and is bent in the direction away from the engine 5 on the lower side of the cabin 7. The exhaust outlet side (lower end side) of the urea mixing pipe 35 is connected to the lower side of the left side of the second case 32. A connection point between the exhaust outlet side of the purification outlet pipe 33 and the exhaust inlet side of the urea mixing pipe 35 is connected to the engine 5 via a flange. The engine 5 supports the exhaust outlet side of the purification outlet pipe 33 and the exhaust inlet side of the urea mixing pipe 35. The lower surface side of the second case 32 is connected to a right front support base 96 described later via a case support bar 48. The exhaust gas that has passed through the first case 31 is introduced into the second case 32 via the purification outlet pipe 33 and the urea mixing pipe 35.

  A urea water injection section 36 is attached to the upper end side of the urea mixing pipe 35. Urea water (reducing agent) in a urea water tank 51 (reducing agent tank), which will be described later, is supplied from the urea water injection unit 36 into the urea mixing pipe 35, and in the exhaust gas from the first case 31 to the second case 32, The urea water is hydrolyzed and mixed as ammonia. Instead of urea water, other reducing agents such as anhydrous ammonia and aqueous ammonia can be used.

  Now, an assist bar 38 is provided on the right side of the front portion of the box-shaped cabin frame 37 constituting the cabin 7. A plurality of vertically long tail pipes 39 that discharge exhaust gas to the outside are connected to the assist bar 38. A tail pipe 39 is supported by the assist bar 38. The exhaust inlet side of the tail pipe 39 is connected to the exhaust outlet side (upper surface side) of the second case 32. The exhaust gas of the engine 5 is purified by the first case 31 and the second case 32 and is discharged from the tail pipe 39 to the outside of the machine.

  In the above configuration, first, particulate matter (PM), carbon monoxide (CO), and hydrocarbon (HC) in the exhaust gas from the engine 5 are reduced by the oxidation catalyst and the soot filter in the first case 31. Is done. Next, in the urea mixing pipe 35, the urea water from the urea water injection unit 36 is mixed with the exhaust gas passing through the first case 31, and the urea water is converted into ammonia by the SCR catalyst and the oxidation catalyst in the second case 32. Nitrogen oxide (NOx) in the mixed exhaust gas is reduced. Then, the exhaust gas that has passed through the second case 32 is discharged from the tail pipe 39 to the outside of the machine.

  As shown in FIGS. 1 and 2, the cabin 7 is supported by the traveling machine body 2 via left and right front support tables 96 and left and right rear support tables 97. A front support 96 is bolted to the front end of the left and right machine frame 15 and the front bottom of the cabin 7 is supported on the upper surface of the front support 96 via a vibration isolating rubber member 98. doing. Further, a rear support base 97 is bolted to the outer side surface of the rear housing 74 provided on the left and right of the straight traveling mission case 17, and the rear side of the cabin 7 is provided on the upper surface side of the rear support base 97 via a vibration isolating rubber body 99. Anti-vibration support for the bottom. Accordingly, the cabin 7 is supported by the traveling machine body 2 in a vibration-proof manner via the plurality of vibration-proof rubber bodies 98 and 99.

  The left and right rear support bases 97 constitute the bottom surfaces of the corresponding left and right fender portions 21. The left and right fuel tanks 11 are placed on the corresponding left and right rear support bases 97 and fixed by bands 40. The left and right fuel tanks 11 communicate with each other via a fuel communication pipe (not shown). An extension base 75 is provided on the front side of the left and right rear support bases 97. On the left extension stand 75, a battery 50 for supplying power is arranged so as to be accommodated in the left fender portion 21. On the right extension stand 75, a urea water tank 51 as a reducing agent tank is disposed so as to be accommodated in the right fender portion 21. The urea water tank 51 is a box-shaped container that stores urea water (urea aqueous solution for selective catalyst reduction). An insert nut (not shown) is embedded in the bottom surface of the urea water tank 51. The bottom surface of the urea water tank 51 and the right extension base 75 are fastened with bolts and insert nuts, and the urea water tank 51 is stably fixed and supported. If comprised in this way, the urea water tank 51 with a small capacity | capacitance and the fuel tank with a large capacity | capacitance will be utilized effectively, using the dead space of the front low and high height called the fender part 21 formed in the right-and-left side part of the cabin 7 (control part). 11 can be efficiently arranged side by side, and an increase in the size of the tractor 1 can be suppressed.

  As shown in FIGS. 2 and 5, a urea water supply device 107 (supply module, reduction unit) that supplies urea water in the urea water tank 51 so as to be accommodated in the right fender portion 21 on the front side of the urea water tank 51. The agent supply device) is supported on the right extension stand 75. In the embodiment, the urea water supply device 107 is fastened to the front side of the support plate plate 76 erected on the front side of the right extension base 75. Although not shown in detail, the urea water supply device 107 includes a urea water pump that pumps the urea water in the urea water tank 51 and a drive motor that drives the urea water pump. When the urea water supply device 107 supplies the urea water in the urea water tank 51 to the urea water injection unit 36 of the urea mixing pipe 35, the urea water is sprayed from the urea water injection unit 36 into the urea mixing pipe 35. By disposing the urea water supply device 107 on the front side of the urea water tank 51, the front, low, and high dead space called the fender portion 21 is used more efficiently.

  The supply cylinder 56 of the urea water tank 51 protrudes obliquely upward and leftward and outward on the front side of the right fender portion 21. The fuel supply cylinders 55 of the left and right fuel tanks 11 project obliquely upward and leftward and outward on the rear side of the left and right fender portions 21. In the right fender portion 21, the height position of the supply cylinder 56 of the urea water tank 51 is set lower than the fuel supply cylinder 55 of the left fuel tank 11. By changing the front-rear position and the height positional relationship between the supply cylinder 56 and the fuel supply cylinder 55, fuel supply and urea water supply can be performed from the same side (left side) of the traveling machine body 2, while the fuel and It makes it difficult to make mistakes with urea water.

  As described above, the left and right fender portions 21 are each covered with the fender cover 26. The left and right fuel tanks 11, the battery 50, and the urea water tank 51 are hidden by the fender cover 26. Therefore, the aesthetics of the tractor 1 are good. The right fender cover 26 having the urea water tank 51 is provided with a replenishment opening window 132 at a position corresponding to the replenishment cylinder 56. Further, an oil supply opening window 131 is formed at a location corresponding to the oil supply cylinder 55 in the right fender cover 26. The open windows 131 and 132 are provided with lid covers 133 and 134 that can be opened and closed. Since the replenishing lid cover 134 is close to the right door of the cabin 7, it is opened rearward and outward via a hinge provided on the rear side. For this reason, even if the right door of the cabin 7 is opened with the replenishing lid cover 134 open, the two do not collide (buffer). The oil supply lid cover 133 is opened forward and outward through a hinge provided on the front side. A maintenance opening window 135 is formed at a position corresponding to the battery 50 in the left fender cover 26, and a maintenance lid cover 136 that can be opened and closed is provided in the maintenance opening window 135. Needless to say, the positional relationship between the urea water tank 51 and the battery 50 is not limited to the example in the embodiment, and may be interchanged left and right.

  As shown in FIG. 7, the engine 5 (cooling water pump) and the urea water injection unit 36 are communicated with each other by a cooling water feed pipe 101 and a cooling water return pipe 102. One end of the cooling water feed pipe 101 and the cooling water return pipe 102 is connected to the engine 5 (cooling water pump), and the other end of the cooling water feed pipe 101 and the cooling water return pipe 102 is connected to the urea water injection section 36. Connected. The cooling water feed pipe 101 and the cooling water return pipe 102 are connected in the urea water injection unit 36. The cooling water heated by the engine 5 is sent from the cooling water feed pipe 101 to the cooling water return pipe 102 and passes through the urea water injection section 36, thereby preventing the urea water from freezing in the urea water injection section 36. Is done. The cooling water that has passed through the urea water injection unit 36 is returned to the engine 5 (cooling water pump) via the cooling water return pipe 102.

  A cooling water supply pipe 103 is branched from the middle part of the cooling water feed pipe 101. The cooling water supply pipe 103 is connected to a tank sensor unit 58 attached to the urea water tank 51. In this case, an upward concave recess 51 a is formed on the upper surface side of the urea water tank 51. A tank sensor 58 is detachably attached to the upper surface opening formed in the recess 51 a of the urea water tank 51. The tank sensor unit 58 also functions as a lid for the upper surface opening. A cooling water supply pipe 103, a cooling water recovery pipe 104, a urea water feed pipe 105, a urea water return pipe 106, and the like are connected to the tank sensor unit 58.

  The cooling water supply pipe 103 and the cooling water recovery pipe 104 are connected in the urea water tank 51. The cooling water recovery pipe 103 is connected to the engine 5 (cooling water pump). The cooling water heated by the engine 5 is sent from the cooling water supply pipe 103 to the cooling water recovery pipe 104 and passes through the urea water tank 51, so that the urea water in the urea water tank 51 is prevented from freezing. . The cooling water that has passed through the urea water tank 51 is returned to the engine 5 (cooling water pump) via the cooling water recovery pipe 104.

  The other end side of the urea water feed pipe 105 and the urea water return pipe 106 whose one end side is connected to the tank sensor unit 58 is the urea that supplies urea water in the urea water tank 51 to the urea water injection unit 36 of the urea mixing pipe 35. It is connected to the water supply device 107. The urea water supply device 107 is connected to the urea water injection unit 36 via the urea water injection pipe 108. The urea water supply device 107 sucks the urea water in the urea water tank 51 through the urea water feed pipe 105, supplies the urea water to the urea water injection unit 36 through the urea water injection pipe 108, and urea in the urea mixing pipe 35. Spray water. Excess urea water is returned into the urea water tank 51 through the urea water return pipe 106.

  As shown in FIG. 5, one end side of a breather pipe 109 for pressure release in the urea water tank 51 is connected to the tank sensor portion 58 of the urea water tank 51. The other end of the breather pipe 109 is bifurcated. One branched pipe portion 109a extends upward and opens. The other branched pipe portion 109b is open on the left and right center side of the traveling machine body 2 (in the left and right sides of the traveling crawler 3) and downward. For this reason, when supplying urea water, outside air is introduced from the upward pipe portion 109a of the breather pipe 109, and the pressure in the urea water tank 51 is kept constant. For example, even if the urea water tank 51 is shaken by vibrations of the engine 5 or unevenness of the field, the urea water spills from the downward pipe portion 109 b of the breather pipe 109 even if the urea water enters the breather pipe 109. In addition, it is possible to avoid the possibility of blocking the upward pipe portion 109a due to adhesion deposition of urea or the like. Smooth introduction of outside air through the breather pipe 109 can be ensured.

  In addition, the structure of each part in this invention is not limited to embodiment of illustration, A various change is possible in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Crawler tractor 2 Traveling machine body 3 Traveling crawler 5 Diesel engine 7 Cabin 13 Turning mission case 17 Straight traveling mission case 21 Fender part 26 Fender cover 31 First case 32 Second case 33 Purification outlet pipe 35 Urea mixing pipe 36 Urea water injection Part 39 Tail pipe 50 Battery 51 Urea water tank 55 Refueling cylinder 56 Replenishment cylinder 58 Tank sensor part 74 Rear housing 75 Extension base 76 Support plate plate 97 Rear support base 107 Urea water supply device 131 Refueling opening window 132 Replenishment opening window 133 Refueling cover 134 Refill cover

Claims (4)

A traveling machine body equipped with an engine and a transmission case, a pair of left and right traveling crawlers that support the traveling machine body, a post-treatment device that purifies exhaust gas of the engine, and a reducing agent that is supplied to the post-treatment device are stored. In a crawler tractor comprising a reducing agent tank,
A rear support that supports the rear side of the control unit of the traveling aircraft body is attached to the rear housing provided on the left and right outer surfaces of the mission case so that the rear case is accommodated in a fender unit provided on the left and right sides of the control unit. A pair of left and right fuel tanks are distributed and mounted on the left and right rear support bases, an extension base is provided on the front side of each of the rear support bases, and the reducing agent tank is provided on either the left or right extension base. It is mounted so that it can be accommodated in the department.
Crawler tractor. A reducing agent supply device for supplying a reducing agent in the reducing agent tank is mounted on the extension base so as to be housed in the fender portion on the front side of the reducing agent tank.
The crawler tractor according to claim 1. The replenisher cylinder of the reductant tank protrudes diagonally upward and left and right outward on the front side of the fender part, while the fuel tank of the fuel tank protrudes diagonally upward and left and right outward on the rear side of the fender part. Is set lower than the fuel cylinder,
The crawler tractor according to claim 1. Each fender portion is covered with a fender cover, and an opening window is formed at a position corresponding to the refilling cylinder and the fueling cylinder on the fender cover having the reducing agent tank, and the opening windows can be opened and closed. A special lid cover,
The crawler tractor according to claim 1.

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