Kubota U48-5 U55-4 Excavator Pilot Valve Assembly Guide

This instruction show you guide on how to assemble pilot valve for Kubota U48-4/U55-4 excavator.If you want know disassemble steps,please refer to: How to Disassemble Pilot Valve for Kubota U48-4 Excavator?

 

Related Contents:

Takeuchi Excavator Workshop EPC+Service Manual 2018 PDF Files

2022 Kubota Takeuchi Diagmaster v22.08.01 v4.1.2 Software Free Download

Kubota EPC Spare Parts Catalogue 2021.06 Download

 

 

Procedures:

CAUTION
• Prepare your workbench in the same way as for disassembly.
• Follow the same general precautions as in the disassembly.
• When assembling the parts, remove all bits of metal or foreign matter from all the parts and make sure there aren’t any burrs or dings on the parts.
• Replace used O-rings with new ones.
• Take care not to damage the O-rings when installing them.

 

1.Make sure there aren’t any burrs or scratches inside the casing.

2.Install the return spring (11) in the casing.
IMPORTANT
• Install it in the same position as before disassembly.

(11) Spring

3.Install the metal washer (8), spring (13) and spring seat (7) in order to the spool (14).
IMPORTANT
• Do not depress the spring seat 6mm (0.2 in.) or more.
• Be careful not to scratch the spool.

(7) Spring seat
(8) Metal washer 2
(13) Spring
(14) Spool

4.Install the reducing valve ASSY.
After installing it, make sure the spool moves smoothly.
IMPORTANT
• Install it in the same position as before disassembly.

5.Install the O-ring (6) on the plug (3).

6.Install the seal (5) on the plug (3).
IMPORTANT
• Be careful that the seal faces the right direction.
• Apply hydraulic oil on the circumference and lip of the seal.

(3) Plug
(4) Pushrod
(5) Seal
(6) O-Ring

7.Install the plug (3) on the pushrod (4).
IMPORTANT
• Apply hydraulic oil to the pushrod.

(3) Plug
(4) Pushrod
(6) O-Ring

8.Install the plug ASSY into the case.
If the return spring is too stiff, use the plate to install the ASSY.
IMPORTANT
• Be careful not to scratch the hole of the casing by prying on the spool.
• Take care so the plug ASSY does not go flying.

9.Install the plate (2).

(2) Plate

10.Install the U-joint.

(A) Tool

 

11.Install the nut (disc) (16) on the universal joint.
Tighten it until it touches all four pushrods equally.
CAUTION
• If you tighten it too far, the mechanism will not function properly when the lever is in neutral, so be careful to adjust the nut to the correct position.

(16) Nut (disc)

12.Tighten the nut (adjustment).
Put the wrench on the bolt width of the disc and tighten the nut.
• Tools to use : 22 mm (0.87 in.) wrench (or socket), 32 mm
(1.3 in.) wrench

 

13.Apply grease to the rotating parts of the universal joint and to the ends of the pushrods.

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