Toro Groundsmaster 7210 Service Manual page 179

Removing the Polar Trac Hydraulic Control Valve
Installing the Polar Trac Hydraulic Control Valve
Groundsmaster 7210
16222SL Rev C
Before disconnecting or doing any work on the hydraulic system,
release all the pressure in the system; refer to
from the Hydraulic System (page
1. Park the machine on a level surface, lower the implement, shut off the
engine, set the parking brake, and remove the key from the key switch.
2. Clean the hydraulic hose ends and fittings on the control valve to prevent
contaminants from entering into the hydraulic system.
3. For assembly purposes, label all the hydraulic hoses and fittings.
g033627
1. Control valve
2. Hairpin
4. Disconnect the hydraulic hoses that are connected to the hydraulic fittings on
the control valve. Allow the hoses to drain into a suitable container.
5. Install clean caps or plugs in the hose openings to prevent system
contamination.
6. Remove the 2 hairpins that attach the lever valve links to the control valve
spools (Figure 125). Slide the links from the spools.
7. Support the control valve to prevent it from falling during removal.
8. Remove the 2 carriage screws (item 43 in
that attach the control valve to the machine, and remove the control valve
from the machine.
9. If necessary, remove the hydraulic fittings from the control valve. Note the
orientation of the fittings for assembly purposes.
10. Remove and discard the O-rings from the fittings.
1. If the hydraulic fittings were removed from the control valve, lubricate and
install new O-rings to the fittings. Install the fittings into the valve ports; refer
to Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fitting into
the Component Port) (page
removal to orientate the fittings.
WARNING
4–11).
Figure 125
3. Lever valve link
4–7). Use the notes that you recorded during
Page 4–119
Releasing Pressure
Figure 124) and 2 flange nuts
Hydraulic System: Service and Repairs