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Workman HD Series Page 9 − 65 Hydraulic System
5. Visually inspect cartridge valve for damaged sealing
surfaces and contamination.
A. Contamination may cause valves to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing malfunction.
B. If valve sealing surfaces appear pitted or dam-
aged, the hydraulic system may be overheating or
there may be water in the system.
CAUTION
Use eye protection such as goggles when using
compressed air.
6. Clean cartridge valve using clean mineral spirits.
Submerge valve in clean mineral spirits to flush out con-
tamination. Particles as fine as talcum powder can affect
the operation of high pressure hydraulic valves. If car-
tridge design allows, use a wood or plastic probe to push
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 and backup rings must be arranged 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. Using a deep socket, torque cartridge valve 25 ft−
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.
Installation (Fig. 48)
1. If fittings were removed from manifold, lubricate and
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).
2. Install manifold to vehicle.
3. Replace O−rings on hydraulic hoses and fittings. Re-
move caps and plugs from hoses and fittings. Connect
hydraulic hoses to manifold (see Hydraulic Hose and
Tube Installation in the General Information section).
4. Check oil level in reservoir. Add correct oil if neces-
sary.
Hydraulic
System