Brush Bandit 1290XP, Operating & Parts Manual

Page: 89 / 140

Bandit
Copyright 12/07 PAGE 67
MODELS 1290XP/1590
CONTROL VALVE DETENT ASSEMBLY AND
O-RING REPLACEMENT
HYDRAULIC SECTION
Assembly:
1) Lubricate spool, o-rings, and back-up rings with clean oil. Insert spool and center it in the valve body.
2) Place the new o-rings and back-up rings over spool ends and seat them into the valve body. Seat
the seal retainer onto back-up ring making sure not to pinch the o-ring or back-up ring against the valve
body.
) Re-attach the hand lever to the spool. Mount control lever assembly onto the valve body using the (2)
two socket head cap screws.
4) Thread a new detent assembly onto the spool end and hand tighten with the 1/2” drag link drive socket
blade. No additional lubricant is required.
5) Mount the spring cover and the (2) socket head cap screws.
6) Hand tighten all (4) four socket head cap screws with the 3/16” Tee handle hex driver.
7) Shift valve with hand lever to assure operation. With some effort, the hand lever should move between
three positions. The detent will hold the hand lever in the three positions.
Tools Required:
- Small amount of clean hydraulic oil
- Clean working area, free of debris and shop rags
- 3/16” Tee handle hex driver
- 1/2” drag link drive socket
- jawed vice
General Procedure:
Disassembly:
1) Secure valve in vice or suitable method to
firmly hold valve.
2) Note the orientation and placement of all
components during disassembly.
3) Using the 3/16” Tee handle hex driver, remove
(2) two socket head cap screws which holds
the spring cover to the valve body. Set aside
for re-use.
) The detent assembly is now visible. Insert the
1/2” drag link drive socket blade into slot of
retaining screw. Loosen and remove the
retaining screw along with the entire detent
assembly.
5) With the 3/16” Tee handle hex driver, remove
(2) two socket head cap screws that hold the
control lever assembly to the valve body.
6) Detach hand lever from spool. Carefully
remove valve spool from valve body. Take
care not to scratch, dent, or nick the spool.
Note the orientation of handle attachment point
on spool. Set aside for re-use.
7) Remove (2) seal retainers, o-rings, and
back-up rings from both ends of the valve.
8) Inspect and replace o-ring and back-up ring if
cut, or if leak is suspected.
Instructions and illustrations provided by component manufacturer.
Valve Spool
Spring
Cover
Detent
Assembly
Relief
Valve Kit
Valve Body
Hand Lever
Seal
Retainer
O-Ring
O-Ring
Back-Up
Ring
Back-Up
Ring
Seal
Retainer