caution - Toro
caution - Toro
caution - Toro
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4WD Manifold Service (Fig. 60)<br />
1. Make sure the manifold is clean before removing the<br />
valve.<br />
2. If cartridge is solenoid operated, remove nut securing<br />
solenoid to the cartridge valve. Carefully slide solenoid<br />
off the valve.<br />
IMPORTANT: Use care when handling the valve cartridge.<br />
Slight bending or distortion of the stem tube<br />
can cause binding and malfunction.<br />
3. Remove cartridge valve with a deep socket wrench.<br />
Note correct location for O--rings, sealing rings and<br />
backup rings. Remove and discard seal kit.<br />
4. Visually inspect the port in the manifold for damage<br />
to the sealing surfaces, damaged threads or contamination.<br />
5. Visually inspect cartridge valve for damaged sealing<br />
surfaces and contamination.<br />
A. Contamination may cause valves to stick or hang<br />
up. Contamination can become lodged in small valve<br />
orifices or seal areas causing malfunction.<br />
B. If valve sealing surfaces appear pitted or damaged,<br />
the hydraulic system may be overheating or<br />
there may be water in the system.<br />
8. Reinstall the cartridge valve:<br />
A. Lubricate new seal kit components with clean hydraulic<br />
oil and install on valve. The O--rings, sealing<br />
rings and backup rings must be arranged properly on<br />
the cartridge valve for proper operation and sealing.<br />
IMPORTANT: Use care when handling the valve<br />
cartridge. Slight bending or distortion of the<br />
stem tube can cause binding and malfunction.<br />
B. Thread cartridge valve carefully into manifold<br />
port. The valve should go in easily without binding.<br />
C. Torque cartridge valve using a deep socket to value<br />
identified in manifold illustration.<br />
D. If cartridge is solenoid operated, carefully install<br />
solenoid coil to the cartridge valve. Torque nut to value<br />
identified in manifold illustration.<br />
9. If problems still exist, remove valve and clean again<br />
or replace valve.<br />
Hydraulic<br />
System<br />
CAUTION<br />
Use eye protection such as goggles when using<br />
compressed air.<br />
6. Clean cartridge valve using clean mineral spirits.<br />
Submerge valve in clean mineral spirits to flush out contamination.<br />
Particles as fine as talcum powder can affect<br />
the operation of high pressure hydraulic valves. If cartridge<br />
design allows, use a wood or plastic probe to push<br />
the internal spool in and out 20 to 30 times to flush out<br />
contamination. Be extremely careful not to damage cartridge.<br />
Use compressed air for cleaning.<br />
7. The 4WD control manifold includes three (3) orifice<br />
fittings (items 9 and 13). The 0.030 orifice (item 9) is<br />
positioned in the SV port under the solenoid cartridge<br />
valve. The 0.050 orifices (item 13) thread into the manifold<br />
in ports OR1 and OR2. Before removing or installing<br />
the orifice in OR1, removal of the #6 plug in the<br />
bottom of the manifold is necessary.<br />
Groundsmaster 4100--D<br />
Page 4 - 87<br />
Hydraulic System