4.
to the sealing surfaces, damaged threads, or contami-
nation.
Visually inspect the port in the manifold for damage
4
2
5.
surfaces or contamination.
Visually inspect cartridge valve for damaged sealing
3
A. Contamination may cause valves to stick or hang
up. Contaminants can become lodged in small valve
orifices or seal areas causing malfunction.
1
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
Figure 56
1.
2.
Manifold assembly
3.
Braking valve (BV)
Logic valve (LC1)
SRV cartridge valve (R1)
4.
Use eye protection such as goggles when using
compressed air.
3
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.
1
3
4
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
5
2
7.
Reinstall the SRV cartridge valve:
Figure 57
1.
2.
3.
SRV cartridge valve
Solenoid coil
Seal kit o--rings
4.
5.
Seal kit backup rings
Solenoid nut
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
30
to 35 ft--lb (41 to 47 N--m).
D. Install solenoid coil to the cartridge valve. Apply
“Loctite242”orequivalenttothethreadsofthevalve.
Torque nut from 4 to 6 ft--lb (5 to 8 N--m).
8.
If problems still exist, remove valve and clean again
or replace valve.
Groundsmaster 3500--D
Page 4 -- 83
Hydraulic System (Rev. D)
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