Toro Groundsmaster 7210 Service Manual page 176

Servicing the Lift Control Manifold
Hydraulic System: Service and Repairs
Before opening the hydraulic system, operate all the hydraulic
controls to release system pressure and avoid injury from the
pressurized hydraulic fluid; refer to
Hydraulic System (page
If the lift control manifold is attached to the machine, ensure that the
cutting deck is fully lowered and supported before loosening the
hydraulic lines, and cartridge valves, or plugs from the lift manifold.
If the cutting deck is in the raised position while the manifold
components are loosened, the deck may drop unexpectedly.
The 2 solenoid valves in the lift control manifold are different.
Label the valves before removal so that the valves can be correctly
installed into the manifold.
1. Ensure that the lift control manifold is clean before you remove the cartridge
valve from the manifold.
2. Remove the nut that secure the solenoid coil to the cartridge valve. Carefully
slide the coil off the valve.
Carefully handle the cartridge valve. Slight bending or distortion of
the stem tube can cause binding and malfunction. When removing
the cartridge valve from the manifold, ensure that the deep well
socket fully engages the valve base.
3. Use a deep socket wrench to remove the cartridge valve from the manifold.
Note the correct location of the O-rings, sealing rings, and back-up rings.
4. Remove and discard the seal kit from the cartridge valve.
5. Visually examine the port in the manifold for damaged sealing surfaces,
damaged threads, and contamination.
6. Visually inspect the cartridge valve for damaged sealing surfaces and
contamination.
A. Contamination can cause the valves to stick or hang up. Contamination
can accumulate in small valve orifices or seal areas and cause
malfunction.
B. If the sealing surfaces of the valve are pitted or damaged, the hydraulic
system can be too hot or there can be water in the system.
CAUTION
Releasing Pressure from the
4–11).
WARNING
IMPORTANT
IMPORTANT
Page 4–116 Groundsmaster 7210
16222SL Rev C