Disassembling the Polar Trac Hydraulic Control Valve (continued)
IMPORTANT
Match-mark spools to their associated bores before disassembly.
The spools must be installed again to the bore from which they
were removed.
2. Remove the 2 spool caps (item 10 in
) and slide the spool
assemblies from their bores.
3. Remove the O-ring (item 12 in
) and bushing from each spool
assembly.
4. Remove the wiper seals (item 20 in
) and O-rings from the spool
bore ends that are opposite to the spool caps.
Note:
Disassemble the spool assemblies only if the retaining ring (item 13 in
), spacer, spool spring, or washer needs replacement.
5. Remove the seat retaining plugs (items 7 and 15 in
), back-up
washers, O-rings, and check spring from the valve body.
6. Remove the check poppet (item 1 in
), seats, O-rings, and
plungers from the valve body.
7. Remove the solid plug (item 6 in
), back-up washer, and O-ring
from the opposite end of the plunger.
8. Remove the detent plug (item 19 in
) and O-ring from the valve
body, and remove the disc, spring, and detent plunger from the body.
Inspecting the Polar Trac Hydraulic Control Valve
1. Inspect the spools and spool bores for wear. If wear is excessive, replace the
control valve with new one.
2. Inspect the springs and replace as necessary.
3. Inspect the plunger and detent plunger for wear. Replace as necessary.
4. Inspect the caps and plugs for damaged threads and inspect the O-ring
sealing surfaces. Replace as necessary.
Assembling the Polar Trac Hydraulic Control Valve
IMPORTANT
Do not wipe the control valve parts dry with paper towels or a cloth.
They let lint accumulate in the hydraulic system, which will damage
it.
CAUTION
Use eye protection such as goggles when using compressed air.
1. Clean all the metal parts with solvent and blow dry with compressed air.
2. Replace the check poppet (item 1 in
), O-rings, and back-up
washers with new ones.
3. Install new O-rings (item 12 in
) into the valve body.
Hydraulic System: Service and Repairs
Page 4–122
Groundsmaster 7210
16222SL Rev C
Summary of Contents for Groundsmaster 7210
Page 4: ...NOTES Revision History Page 4 Groundsmaster 7210 16222SL Rev C...
Page 32: ...Specifications and Maintenance Special Tools Page 2 16 Groundsmaster 7210 16222SL Rev C...
Page 60: ...Diesel Engine Service and Repairs Page 3 28 Groundsmaster 7210 16222SL Rev C...
Page 196: ...Hydraulic System Service and Repairs Page 4 136 Groundsmaster 7210 16222SL Rev C...
Page 304: ...Chassis Service and Repairs Page 6 42 Groundsmaster 7210 16222SL Rev C...
Page 327: ...Drawing 105 7260 Rev E Sheet 1 16222SL Rev C Page A 3 Hydraulic Schematic g186843...
Page 328: ...Page A 4 16222SL Rev C Drawing 119 4372 Rev C Sheet 1 Electrical Schematic Platform g186842...
Page 329: ...Drawing 119 4377 Rev C Sheet 1 16222SL Rev C Page A 5 Electrical Schematic Engine g186841...
Page 336: ...Page A 12 16222SL Rev C Drawing 119 4386 Rev A Sheet 1 Wire Harness Drawing Cab Power g186851...
Page 342: ......
