Toro Groundsmaster 3280-D Service Manual page 225

Servicing the Control Manifold Cartridge Valve (continued)
Groundsmaster ® 3280-D/3320
05138SL Rev B
Sudden movement of the internal valve spools can release the
stored fluid suddenly.
6. Use clean-mineral spirits and clean the cartridge valve. Put the valve in the
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 the compressed
air for cleaning.
7. Install the cartridge valve as follows:
A. Lubricate the new seal kit components with clean hydraulic fluid and
install them onto the valve.
B. Install the O-rings, sealing rings, and back-up rings correctly on the
cartridge valve for proper operation and sealing.
Carefully handle the valve cartridge. Slight bending or distortion
of the stem tube can cause binding and malfunction. When
installing the cartridge valve into the control manifold, ensure
that the deep well socket fully engages the valve base.
C. Turn the cartridge valve carefully into the manifold port. The valve should
go in easily without binding.
D. Use a deep well socket and torque the cartridge valve to the values
identified in Figure
8. If the solenoid coil was removed from the cartridge valve, do the following
steps:
A. Carefully install the coil onto the valve.
Overtightening the nut can damage the solenoid or cause valve
malfunction. Do not overtighten the nut.
B. Install the nut and torque the nut to 6.7 N∙m (5 ft-lb).
9. If the problems still exist, remove the valve and clean it again or replace
the valve.
CAUTION
IMPORTANT
IMPORTANT
110.
IMPORTANT
Page 5–141 Hydraulic System: Service and Repairs