5.
surfaces and contamination.
Visually inspect cartridge valve for damaged sealing
Installation (Fig. 45)
If fittings were removed from manifold, lubricate and
1.
A. Contamination may cause valves to stick or hang
up.Contamination canbecome lodgedinsmallvalve
orifices or seal areas causing malfunction.
place new O--rings onto fittings. Install fittings into man-
ifold openings using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Infor-
mation section of this chapter).
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
2. Install manifold to vehicle using Figure 45 as aguide.
3.
Replace O--rings onhydraulic hoses and fittings. Re-
CAUTION
move caps and plugs from hoses and fittings. Connect
hydraulic hoses to manifold (see Hydraulic Hose and
Tube Installation in the General Information section).
Use eye protection such as goggles when using
compressed air.
4. Check oil level in reservoir. Add correct oil if neces-
sary.
6.
Clean cartridge valve using clean mineral spirits.
Submerge valve in clean mineral spirits to flush out con-
tamination. Particles asfineastalcumpowder canaffect
the operation of high pressure hydraulic valves. If car-
tridgedesign allows,useawoodor plastic probe topush
the internal spool in and out 20 to 30 times to flush out
contamination. Be extremely careful to not damage car-
tridge. Use compressed air for cleaning.
7.
Reinstall the cartridge valve:
A. Lubricate new seal kit components with clean hy-
draulic oil and install on valve. The O--rings, sealing
rings andbackup rings must bearranged properly on
the cartridge valve for proper operation and sealing.
IMPORTANT: Use care when handling the car-
tridge valve. Slight bending or distortion of the
stem tube can cause binding and malfunction.
B. Thread cartridge valve carefully into manifold
port. The valve should go in easily without binding.
C. Usingadeepsocket,torquecartridgevalve 25ft--
lb (34 N--m).
D. Slide solenoid coil onto the cartridge valve. Install
nut and torque 5 ft--lb (6.8 N--m). Over--tightening
may damage the solenoid or cause the valve to mal-
function.
8.
If problems still exist, remove valve and clean again
or replace valve.
Workman HD Series
Page 9 -- 59
Hydraulic System
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