Bush Hog CBH80 Operator's Manual download pdf (Page 27)

MODEL CBH 60 MONOBLOCK

VALVE REPAIR - DISASSEMBLY

Replacing Spools Seals:

Note: For the purpose of these instructions we will

consider the control handle side of the valve as the

FRONT, and the opposite side as the BACK.

1. Remove control valve from the backhoe.

2. Throughly clean the exterior of the valve before

beginning disassembly procedures.

3. At the BACK of the valve remove all bonnet

assembly parts which are connected to the spool.

Keep parts in the order of disassembly. See each

valve section parts breakdown for the parts involved

in the make-up of the bennet assembly.

IMPORTANT: DO NOT remove the spool from

the valve. The seals can be replaced externally.

Prevent spools from turning or moving by

inserting a screw drive through the clevis slot,

or by running a rod through the pin hole and

using the rod as a handle.

DO NOT hold the spool with a wrench. This will

destroy the finish.

4. At the BACK of the valve, remove seal retainer,

back-up washer, and spool O-ring seal, or retaining

sleeve, bonnet O-ring seal and spool O-ring.

5. Throughly clean counter bores.

6. Install new seals:

A. Spring-Centered Bonnet Assembly Only:

Lightly oil new O-ring seal. Slide seal over valve

spool and insert weal in counter bore. Replace back-

up washer and seal retainer.

B. Float Bonnet Assembly Only:

Lightly oil new O-rings. Install O-rings into spacer.

Slide spacer with O-rings over valve spool being

careful to orient as shown in boom valve section

breakdown.

7. At the BACK of the valve replace bonnet assem-

bly parts, reversing the order in which they were dis-

assembled in step 3. Use 6 - 8 ft. lbs. Torque to

tighten assembly screw on spring centered bonnet

assembly.

8. At the FRONT of the valve remove all parts con-

nected to the spool (handle, linkage, etc.).

9. At the FRONT of the valve remove seal plate

retainer, back-up washer and spool O-ring seal.

10. Throughly clean counter bore.

11. Lightly oil new O-ring seal. Slide O-ring seal over

valve spool and insert in seal counter bore. Replace

back-up washer and seal plate retainer.

12. Reattach all parts connected to the spool (han-

dle, linkage, etc.)

FRONT

MODEL CBH 60

MONOBLOCK VALVE

Bonnet

Assembly

Seal Plate

Back Up Washer

“O”- Ring

Float

Bonnet

Assembly

Figure 11

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Bush Hog CBH80 Operator's Manual Page 27

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