Groundsmaster 3500--D Hydraulic System (Rev. D)Page 4 -- 83
4. Visually inspect the port in the manifold for damage
to the sealing surfaces, damaged threads, or contami-
nation.
5. Visually inspect cartridge valve for damaged sealing
surfaces or contamination.
A. Contamination may cause valves to stick or hang
up. Contaminants can become lodged in small valve
orifices or seal areas causing malfunction.
B. If valve s ealing 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. Use a probe (wood dowel or brass drift) to
push the internal spool in and out 20 to 30 times to flush
out contamination. Particles as fine as talcum powder
can affect the operation of high pressure hydraulic
valves. Use compressed air for cleaning.
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
7. Reinstall the SRV c artridge valve:
A. Lubricate new o--rings of seal kit with clean hy-
draulic oil and install. The o--rings must be arranged
properly on the cartridge valve for proper operation
and sealing (Fig. 57).
B. Thread valve carefully into port R1. The valve
should go in easily without binding.
C. Torque cartridge valve using a deep socket from
30to35ft--lb(41to47N--m).
D. Install solenoid coil to the cartridge valve. Apply
“Loctite 242” or equivalent to the threads of the valve.
Torquenutfrom4to6ft--lb(5to8N--m).
8. If problems still exist, remove valve and clean again
or replace valve.
1. Manifold assembly
2. SRV cartridge valve (R1)
3. Braking valve (BV)
4. Logic valve (LC1)
Figure 56
2
4
1
3
1. SRV cartridge valve
2. Solenoid coil
3. Seal kit o--rings
4. Seal kit backup rings
5. Solenoid nut
Figure 57
1
5
4
2
3
3
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