Service Manual

Relief Valve-Removal/lnspection Dampening Piston-Installation
Relief Valve Plug 15 Install new back-up rings nearest to the smooth
piston face and O-rings in grove on a new piston.
16 Lubricate outer surface of the pistons. Press pistons
(smooth face up) in bores in pintle to the bottom
Ball position.
Check Valve-Removal
Note: Removal of check valves is not necessary if
check valve balls move freely and seat properly.
Fig. 10
11 Use a 1/4” allen wrench to remove relief valve plug.
Then remove spring and ball.
12 Inspect all parts for irregularities. Replace any
defective part.
Relief Valve-Installation
13 Install ball, spring and plug in pintle. Screw plug in
to just below surface of pintle.
Do not tighten
Dampening Piston- Removal
Note: Remove only if surface is scored.
Dampening
Piston
Bolt Glued
To Piston
Check Valve
Body
lo
O-ring Seals (2)
Fig. 11
14 To remove pistons, firmly tap the outside edge of
pintle on a work surface. Remove back-up ring and
O-ring from pistons.
Important: When dislodging dampening pistons, do
not hit pintle journals or the pintle housing
will be
ruined.
Note:
If tapping of pintle does not dislodge the pistons,
use adhesive to cement a bolt or similar object to the
pistons and pull them from the bore.
Retaining'
Rings
(2)- Coil Pin
Fig. 12
17 Press or drive out the coil pin that retains the two
check valve bodies. Use a four blade 5/16-18 tap to tap
holes in check valve bodies. Insert a long bolt or a
puller, pull the check valve bodies from the pintle
housing and discard them.
18 Remove check balls and retaining ring.
Note: On units with acceleration valves-see steps
23-25 for check valve removal.
19 Inspect check valve balls and retaining rings.
Replace any defective parts.