4WD Manifold Service (Fig. 60)
1.Make sure the manifold is clean before removing the valve.
2.If cartridge is solenoid operated, remove nut secur- ing solenoid to the cartridge valve. Carefully slide sole- noid off the valve.
IMPORTANT: Use care when handling the valve car- tridge. Slight bending or distortion of the stem tube can cause binding and malfunction.
3.Remove cartridge valve with a deep socket wrench. Note correct location for
4.Visually inspect the port in the manifold for damage to the sealing surfaces, damaged threads or contamina- tion.
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 not to damage car- tridge. Use compressed air for cleaning.
7.The 4WD control manifold includes three (3) orifice fittings (items 9 and 13). The 0.030 orifice (item 9) is positioned in the SV port under the solenoid cartridge valve. The 0.050 orifices (item 13) thread into the man- ifold in ports OR1 and OR2. Before removing or instal- ling the orifice in OR1, removal of the #6 plug in the bottom of the manifold is necessary.
8.Reinstall the cartridge valve:
A. Lubricate new seal kit components with clean hy- draulic oil and install on valve. The
IMPORTANT: Use care when handling the valve cartridge. 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. Torque cartridge valve using a deep socket to val- ue identified in manifold illustration.
D. If cartridge is solenoid operated, carefully install solenoid coil to the cartridge valve. Torque nut to val- ue identified in manifold illustration.
9. If problems still exist, remove valve and clean again |
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or replace valve. | Hydraulic System |
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Groundsmaster | Page 4 | Hydraulic System |
