12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Caterpillar


Hydraulic Control Valves

Usage:



Remove And Install Hydraulic Control Valves

1. Remove oil from the hydraulic tank.

2. Remove one screw (7). Loosen bolts (4).

3. Remove cotter pin and pins (3) from linkage (2).

4. Remove cover (1). Remove two bolts and washer (6). Remove plate (5).

5. Identify all oil lines (9) to the valve group (8). Disconnect all oil lines (9) from valve group (8).

6. Remove three bolts (10). Note, washers (11) and mounting (12). Use two persons to remove the valve group (8). The weight of the valve group is 43 Kg (95 lbs.).

NOTE: The following steps are for installation of the valve group.

7. Use two persons to position the valve group on the machine. Install three bolts (10), washers (11) and mounting (12).

8. Connect all oil lines (9) to valve group (8).

9. Position plate (5) and cover (1).

10. Install screws (7) and tighten bolts (4).

11. Put linkage (2) in position on the control valves. Install pin and cotter pin (3).

12. Fill the hydraulic tank with oil to the correct level. See the Operation And Maintenance Manual.

Disassemble Hydraulic Control Valves

Start By:

a. remove hydraulic control valves

1. Remove two bolts (5) and remove bracket (4) from the valve group.

2. Remove three nuts and washers (2) and remove manifold (3) from the valve group. Remove valve (1) from the valve group.

3. Remove two bolts (6) and cover (7) and the O-ring from valve (1). Remove O-rings (8) from the valve body.

4. Remove two bolts (10). Remove the lever group from valve body (1).

5. To disassemble the lever group, remove two bolts (21) and remove housing (12) from housing (9). Note seal (11) between housing (9) and (12).

6. Remove bearing (13), O-ring seal (14), ring (15), bearing (16) and shim (19) from housing (12). Remove lever (24) and boot (23) from cover (22).

7. Remove stem (25) from valve body (1). Compress spring (26) and remove four retainers (27). Remove spring (26) from stem (25).

8. Remove shuttle valve (30) from valve body (1).

9. Remove seals (28), (29) and (30). Remove rings (31) and (32) from shuttle valve (30).

10. Remove plug (39). Remove O-ring (36) from plug (39). Remove spring (35) and stem (34) from valve body (1). Note: Remove washers, if present, from stem (34).

11. Remove plug and O-ring (37) and (38).

Assemble Hydraulic Control Valves

1. Install the O-rings on plugs (37) and (38). Install plugs (37) and (38). Tighten plug (37) to 90 ± 5 N·m (65 ± 4 lb.ft.).

2. Install rings (31), (32) and O-rings (28), (29) and (33) on shuttle valve (30). Install shuttle valve (30) in valve body (1).

3. Install washers (40), if used, in stem (34). Install stem (34) in valve body (1). Install spring (35) in stem (34). Install O-ring (36) on plug (39). Install plug (39) in valve body (1).

NOTE: Washers (40) are used to increase or decrease implement speed. See Form No. SENR3489, Systems Operation, Testing and Adjusting 12G, 120G, 130G and 140G Hydraulic System and Steering, topic, Control Valve Flow Adjustment.

4. Install four retainers (27) and spring (26) on stem (25). Insert stem (25) in valve body (1).

5. Install boot (23) on lever (24). Install the boot and lever in cover (22).

6. Install seal (11) in housing (9). Install housing (12) on housing (9). Install bearing (13), O-ring seal (14), ring (15), bearing (16) and shim (19) on housing (12). Position cover (22) on housing (12) and install washers (20) and bolts (21).

7. Install seal (18) and O-ring (17) in housing (9). Position lever (24) in stem (25) and install bolts and washers (10) that hold the lever group to valve body (1).

8. Install the O-ring in cover (7). Install cover (7) and bolts (6) on valve body (1). Install five O-rings (8) on the valve body.

9. Position the valve (1) and manifold (3) over the three studs and install nuts and washers (2).

10. Position bracket (4) and install bolts (5).

End By:

a. install hydraulic control valves

Remove And Install Combination Valve

Start By:

a. drain the hydraulic tank

1. Remove hose assembly (2) for clearance. Identify and disconnect all hose assemblies (4) from combination valve (5).

2. Remove three bolts and washers (3). Lower combination valve (5) with mounting bracket (1).

3. Remove three bolts and washers (6) and spacers (7). Remove combination valve (5).

NOTE: The following steps are for installation of the combination valve.

4. Position combination valve (5) and spacers (7), under mounting bracket (1). Install bolts and washers (6) to hold the combination valve to the mounting bracket.

5. Position the mounting bracket and install three bolts and washers (3).

6. Connect all hose assemblies (4) to the combination valve (5). Install hose assembly (2).

7. Fill the hydraulic tank to the correct level. See the Operation And Maintenance Manual.

Disassemble And Assemble Combination Valve

Start By:

a. remove combination valve

1. Remove plug (3) and relief valve group (2) from body (1).

2. Remove seal (5) from plug (3). Remove nut (12) from retainer (11). Remove spring (10) and valve (9). Remove housing (8) from valve group (6). Remove seal (7) from housing (8). Remove seals (2) and (4) from valve group (6).

3. Remove six plugs (13) and valve groups (14) and (15) from body (1).

4. Remove O-rings (16) from six plugs (13). Make note of the O-rings on valve groups (14) and (15).

5. Remove seal (21) and two rings (17) from valve group (14). Remove seal (23) and two rings (18). Remove seal (19). Remove seat (20) and ball (22) from valve body (24).

6. Repeat Step 5 for disassembly of valve group (15).

NOTE: The following steps are for assembly of the combination valve.

7. Inspect all O-rings and replace if necessary.

8. Assemble valve group (14) by installing ball (22) and seat (20) in valve body (24).

NOTE: Lower the temperature of seat (20) before installing in valve body (24).

9. Install rings (17) and (18) and seals (21), (23) and (19).

10. Repeat Steps 8 and 9 to assemble valve group (15).

11. Install O-rings (16) on six plugs (13) and install in body (1). Install valve groups (14) and (15) in body (1).

12. Install seal (5) on plug (3). Install seals (2) and (4) on valve group (6). Install seal (7) on housing (8). Install housing (8) in valve group (6). Install valve (9), spring (10) and retainer (11) in housing (8). Install nut (12) on retainer (11).

13. Install plug (3) and relief valve group (2) in valve body (1). Tighten relief valve group (2) to a torque of 65 ± 5 N·m (48 ± 4 lb.ft.).

End By:

a. install combination valve

Caterpillar Information System:

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