Specifications, Service and Repair of Farm and Lawn Tractors

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Kubota BX24, BX25, BX25D - RCK54, RCK60 Mower Deck

Kubota BX24, BX25, BX25D - Setting Up RCK54, RCK60 Mower Deck

Assembling Mower

Place the mower on blocks. Turn the anti-scalp rollers sideways and attach to the arms of the deck at the upper position with clevis pins and snap rings. Remove the blocks. Attach the discharge to the deck with the spring, discharge pin and cotter pin. Secure the spring to the discharge deflector as illustrated.

Setting Mower

Start the engine and the hydraulic lever rearward to raise the mower rear link to the highest position. Stop the engine and remove the key. Roll the mower under the Kubota BX24, BX25, BX25D tractor from right side. Universal Joint - Pull back the coupler of the universal joint. Push the universal joint onto the mid-PTO shaft, until the coupler locks. Slide the universal joint back and forward to make sure the universal joint is locked securely. Finally, tug on the universal joint to make sure it is locked on the PTO shaft. Rear Link - Set the cutting height control dial to zero inch position. Operate the Kubota BX24, BX25, BX25D tractor's hydraulic control lever forward to lower the mower rear links. Attach the rear link to the mower with the L-pins. Front Link - Hook the front link to the front bracket groove. Make sure the length of the front link is 47 mm (1.85 in).

Mounting Front Link

Position the front lever to the front link bracket. Pull and lock the L pin. Then lower the front lever. Hook the front link to the lever fulcrum, and lift the front lever. Release the L pin to lock the front lever. When hooking the front link to the lever fulcrum, normal position of the lever fulcrum groove is open to downward. Check that the front lever is locked securely with the L pin.

RCK54, RCK60 Mower - Cutting Height

Adjusting Front and Rear Cutting Height

Tire pressure must be correct. Make sure the level of the mower blades is adjusted as shown below. Then tighten the lock nuts securely. Turn the cutting height control dial to 2.0 and the anti-scalp roller's height to keep clearance between rollers and ground from 6 to 13 mm (0.25 to 0.5 in.). Turn right blade by hand parallel to direction of travel. Adjust (L) of front links with lock nuts so that A is 0 to 5 mm (0 to 0.2 in.) A = (R)-(F). If the difference between front tip and rear tip of blade is not within the factory specification, adjust the length L of front link with lock nut. The height of rear blade tip R should be bigger than the front. Difference between front tip and rear tip of blade (R-F) - 0.0 to 5.0 mm / 0.0 to 0.20 in. L - Length of Front Link, F - Height of Blade Tip (Front), R - Height of Blade Tip (Rear).

Adjusting Left and Right Cutting Height

Tire pressure must be correct. Operate the hydraulic control lever rearward to raise the mower deck to the highest position. Stop the engine and remove the key. Turn the cutting height control dial to the desired height. Set the anti-scalp roller's height to keep clearance between rollers and ground from 6 to 13 mm (0.2 to 0.5 in.). Lower the RCK54, RCK60 mower deck by moving the hydraulic control lever forward. Turn left blade by hand parallel to Kubota BX24, BX25, BX25D tractor axle and turn right blade parallel to axle to measure from the outside blade tip at Land R to the level surface. The difference between measurement should be less than 3 mm (0.12in.). If the difference between measurement is more than 3 mm (0.12 in.), loosen the lock nut of the left side. Adjust the cutting height fine turning bolts so that the difference between measurement L and R is less than 3 mm (0.12 in.). Then lock the nut. Difference (L-R) between left tip and right tip of blade - Less than 3 mm / 0.12 in. L - Left Blade Measurement Position, R - Right Blade Measurement Position, A - Blade Height.

Adjusting Self-Balance Suspended Linkage

RCK60B-23BX Only - Check the length (L) of balancer spring. If the length (L) is not within the factory specification, adjust the length of balancer spring with lock nut. Check the left and right cutting height difference after adjusting the self-balancer linkage. Balancer spring length (L) (Right and left) - 55.0mm / 2.17 in.

Cutting Height

To reduce the stepped difference in cutting height when mowing rolling terrain, follow the procedure below. To set the cutting height, move the hydraulic control lever rearward to raise the mower to the highest position. Turn the cutting height control dial to adjust height. Set the anti-scalp roller's height as shown to keep clearance between rollers and ground from 6 to 13 mm (0.2 to 0.5 in.). Lower the mower deck by moving the hydraulic control lever forward. Use the higher settings for mowing in a rough area or when mowing tall grass. Lower settings should be used only for smooth lawns where short grass is desired. To set the cutting height, move the hydraulic control lever rearward to raise the Kubota RCK54, RCK60 Mower Deck to the highest position. Turn the cutting height control dial to adjust height. Set the anti-scalp roller's position as shown to have the same cutting height. Dial (Cutting Height): 25 mm (1.0 in.), 32 mm (1.25 in.), 38 mm (1.5 in.), 45 mm (1.75 in.), 51 mm (2.0 in.), 57 mm (2.25 in.), 64 mm (2.5 in.), 70 mm (2.75 in.), 76 mm (3.0 in.), 83 mm (3.25 in.), 89 mm (3.5 in.), 95 mm (3.75 in.), 102 mm (4.0 in.).

Kubota BX24, BX25, BX25D - RCK54, RCK60 Mower Deck Service

Adjusting Mower Link

Tire pressure must be correct. Move the hydraulic control lever rearward to raise the mower to the highest position. Stop the engine and remove the key. Adjust the left side links with bolt so that the clearance L is as follows. Clearance (L) between stopper and rear link - 0 to 0.5 mm oto 0.02 in. Bolt L: 0 to 0.5 mm (0 to 0.02 in.).

Turning Torgue of Pinion Shaft (Kubota BX24, BX25, BX25D)

Remove the mower belt, and reassemble the gear box to the Kubota RCK54, RCK60 mower deck. Wind a string around the pinion shaft and set a spring balance (or push-pull gauge) to the tip of the string, and then slowly pull the spring balance horizontally to measure the turning force. If the measurement exceeds the factory specification, check the bearing and gears and adjust the adjusting shims. RCK54-23BX, RCK60B-23BX: Turning force - Less than 117.7 N / 26.5 lbs. Turning torque - Less than 1.47 Nm / 1.08 ft-Ibs. Thickness of adjusting shims: 0.2 mm (0.0079 in.) / 0.3 mm (0.0118 in.) 0.1 mm (0.0039 in.) / 0.2 mm (0.0079 in.). RCK54P-23BX: Turning force - Less than 0.7 Nm / 0.52 ft-Ibs. Thickness of adjusting shims: 0.2 mm (0.0079 in.) / 0.3 mm (0.0118 in.) / 0.2 mm (0.0079 in.) /0.3 mm (0.0118 in.). Backlash between Bevel Gears - Remove the gear box cap. Place fuses the bevel gear on the input shaft. Turn the input shaft. Take out the fuses and measure the thickness of fuses with an outside micrometer. (Backlash equal thickness of fuse). If the backlash exceeds the allowable limit, adjust with shims. RCK54-23BX, RCK60B-23BX: Backlash between bevel gears (Factory spec/Allowable limit) - 0.10 to 0.20 mm (0.0039 to 0.0079 in.)/0.4mm (0.0157 in.). Thickness of adjusting shims: 0.2 mm (0.0079 in.) 0.3 mm (0.0118 in.). RCK54P-23BX: Backlash between bevel gears (Factory spec/Allowable limit) - 0.13 to 0.25 mm (0.0051 to 0.0098 in.) / 0.40mm (0.0157 in.).

Kubota RCK54, RCK60 Mower Deck Troubleshooting

Blade Does Not Turn: Mid-PTO system malfunctioning - Check transmission. Broken mower belt - Replace mower belt.

Blade Speed Is Slow: Loosen mower belt - Replace mower belt or tension spring. Clogged grass - Remove grass. Flattened out or worn cup washer - Replace cup washer. Engine rpm too low - Mow at full throttle, check and reset engine rpm.

Cutting Is Poor: Worn or broken mower blade - Sharpen or replace mower blade. Loosen mower blade screw - Retighten mower Iblade screw. Cutting height improper - Adjust cutting height. Ground speed too fast - Slow-down. Low tire inflation - Add air to correct. Anti-scalp rollers not adjusted correctly. Adjust anti-scalp rollers.

Mower Is Not Lifted: Broken linkage system - Replace linkage system. Trouble of hydraulic system - Check hydraulic system.

RCK54, RCK60 Mower Tightening Torques (Nm / ft-Ibs)

RCK54, RCK60

Gear box mounting screw and nut - 77.4 to 90.2 / 57.1 to 66.5
Mower blade screw - 102.9 to 117.7 / 75.9 to 86.8
Center pulley holder bolt and nut - 77.4 to 90.2 / 57.1 to 66.5
Outer pulley mounting nut - 196.17 to 225.6 / 144.7 to 166.4
Gear box bracket (RH) mounting bolt and nut - 77.4 to 90.2 / 57.1 to 66.5
Pulley boss mounting nut - 23.5 to 27.4 / 17.4 to 20.3
Pulley holder mounting bolt and nut - 77.4 to 80.2 / 57.1 to 66.5

RCK54-P

Mower blade screw - 103 to 118 / 76 to 87
Gear box screw - 23.5 to 27.4 / 17.4 to 20.2
Gear box mounting screw (for aluminum gear case) - 39.2 to 44.1 / 28.9 to 32.5
Gear box mounting screw and nut - 77.4 to 90.2 / 57.1 to 66.5
Center pulley holder bolt and nut - 77.4 to 90.2 / 57.1 to 66.5
Outer pulley mounting nut - 166.7 to 186.3 / 123.0 to 137.0
Pulley holder mounting bolt and nut - 77.4 to 90.2 / 57.1 to 66.5
Gear box bracket (RH) mounting screw (for aluminum gear case) - 39.2 to 44.1 / 28.9 to 32.5

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