Braking and Logic Cartridge Valves (Fig. 55 and 56)
Make sure manifold is clean before removing the
2
2
3
3
1.
cartridge.
1
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
3
2
2.
wrench. Note: Do not loosen locknut on top of valve.
Remove cartridge valve using a deep socket
3.
the sealing surfaces, damaged threads, or contamina-
tion.
Visually inspect port in the manifold for damage to
4.
surfaces or contamination.
Visually inspect cartridge valve for damaged sealing
Figure 58
1.
2.
Braking cartridge valve
3.
Seal kit backup rings
Seal kit o--rings
A. Contamination may cause valves to stick or hang
up. Contaminates can become lodged in small valve
orifices or seal areas causing malfunction.
2
B. If sealing surfaces appear pitted or damaged, the
hydraulic system may be overheating or there may
be water in the system.
1
3
CAUTION
3
Use eye protection such as goggles when using
compressed air.
5.
Clean cartridge valve using clean mineral spirits.
Submerge valve in clean mineral spirits to flush out con-
tamination.Particlesasfineastalcumpowdercanaffect
the operation of high pressure hydraulic valves. Use
compressed air for cleaning.
Figure 59
1.
2.
Logic cartridge valve
3.
Seal kit backup rings
Seal kit o--rings
IMPORTANT: Use care when handling the cartridge
valve. Slight bending or distortion of the stem tube
can cause binding and malfunction.
6.
Reinstall cartridge valve:
A. Lubricate new o--rings and backup rings of seal
kit with clean hydraulic oil and install. The o--rings
and backup rings must be arranged properly on the
cartridge valve for proper operation and sealing
(Figs. 58 and 59).
B. Thread cartridge valve carefully into the applica-
ble port (Fig. 55). The valve should go in easily with-
out binding. Torque valve to 30 to 35 ft--lb (41 to 47
N--m).
C. If problems still exist, remove valve and clean
again or replace valve.
Hydraulic System (Rev. D)
Page 4 -- 84
Groundsmaster 3500--D
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