Toro Groundsmaster 7210 Service Manual page 177

Servicing the Lift Control Manifold (continued)
Groundsmaster 7210
16222SL Rev C
Use eye protection such as goggles when using compressed air.
Sudden movement of the internal spools can release the stored
fluid suddenly.
7. Use clean-mineral spirits to clean the cartridge valve. Put the valve in
clean-mineral spirits to flush out contamination.
Particles as fine as talcum powder can affect the operation of
high-pressure hydraulic valves.
If the cartridge design allows, use a wood or plastic probe to
press the internal spool in and out for 20 to 30 times to flush out
contamination.
Ensure that you do not damage the cartridge. Use compressed air
for cleaning.
8. Install the cartridge valve into the manifold as follows:
A. Lubricate the new seal kit components with clean hydraulic fluid and
install the components onto the valve.
B. Install the O-rings, sealing rings, and back-up rings correctly on the
cartridge valve for proper operation and sealing.
C. Put the assembled cartridge into the clean hydraulic fluid.
Carefully handle the cartridge valve. Slight bending or distortion
of the stem tube can cause binding and malfunction. When
installing the cartridge valve into the manifold, ensure that the
deep well socket fully engages the valve base.
D. Turn the cartridge valve carefully into the manifold port until it reach
the top of the O-ring. The valve should go into the manifold port easily
without binding.
E. Use a deep socket wrench and torque the cartridge valve as shown in
Figure 123.
9. Carefully install the solenoid coil into the cartridge valve and secure the coil
to the valve with the nut; torque the nut to 6.7 N∙m (60 in-lb).
10. If the problems still exist after manifold assembly, remove the cartridge valve
and clean the valve again or replace the cartridge valve.
CAUTION
CAUTION
IMPORTANT
IMPORTANT
Page 4–117 Hydraulic System: Service and Repairs