Kubota U48-4 U55-4 Excavator Compressor Mount/Removal Guide

Here is the instruction show you guide on how to mounting and remove compressor for Kubota U48-4 and U55-4 excavator.

 

Preparations:

2022 Kubota Takeuchi Diagmaster v22.08.01 v4.1.2 Software Free Download
Kubota DST-i Diagnostic Adapter

Kubota EPC Spare Parts Catalogue 2021.06 Download

 

 

Procedures:

(When removing)
1 Collect the refrigerant from the AC system.
2 Disconnect the negative (-) cable from the battery and the 1P connector of the magnetic clutch.
3 Remove the low-pressure pipe and the high-pressure pipe from the compressor, then immediately cap them so no water or moisture gets into the AC system.
4. Remove the AC drive belt and then the compressor.

(When attaching)
• Adjust the tension of the compressor drive belt. If you press down on the L part of the belt with your fingertips [68.6 N (7 kgf,20 lbf)] and it displaces 12 to 15 mm (0.47 to 0.59 in.), it is correct.
• Attach each bolt and tighten to its specified torque.
• Apply compressor oil to the O-rings.
• Connect the low-pressure hose to the side of the compressor marked “S” (suction). Be careful of the orientation of bolts when installing them.
• Connect the high-pressure hose to the side of the compressor marked “D” (discharge). Be careful of the orientation of bolts when installing them.
• Be careful of the orientation of bushing (compressor) when installing it.

(1) Low-pressure pipe
(2) High-pressure pipe
(3) 1P connector (magnetic clutch)
(4) Compressor
(5) AC drive belt
(6) Clutch, ASSY (magnet,
compressor)
(7) Small screw w/ metal washer
(8) Bolt (clutch)
(9) Bolt
(10) Bolt
(11) Bracket (compressor)
(12) Bolt
(13) Bushing (compressor)
(14) Tensioner pulley
(15) Support (tensioner pulley)
(16) Bolt
(17) Bolt
(18) Clip
(19) Bolt

 

Filling the compressor with oil
When replacing the compressor
• The amount of oil required by the new compressor is enclosed within the AC cycle. A certain amount of compressor oil circulates along with the gas in the AC system.
• When replacing the compressor, remove the excess oil from the new compressor.
• Compressor oil (ND-OIL8) readily absorbs moisture, so seal it immediately.

 

Adjusting clearance
1 Use a feeler gauge to check the clearance.
2 If the measurement is outside the factory specification, adjust the clearance.

 

More repair case for Kubota,please refer to:Kubota Trouble Repair