Main Control Valve - Assemble
Assembly Procedure
Show/hide table
| NOTICE |
|---|
Failure to properly assemble parts or failure to follow established procedures can lead to damage of the parts and assembly. To avoid damage to parts, always identify and mark the parts so that they can be installed in the same location. Ensure that gear surfaces align. Never force parts during assembly. |
Note: Make sure that all of the parts of the main control valve are thoroughly clean and free of dirt and debris. Remove any scratches or burrs from the valve components with polishing paper or an oil stone. Check the condition of all the backup rings and the springs. If any of the components are worn or damaged, use new parts for replacement. Replace all O-ring seals with new O-ring seals. Put clean hydraulic oil on all of the components of the main control valve as the components are being installed. Make sure that all of the parts are installed in the part's original location.
- Install O-rings (106) to the left and the right sections of the main control valve.
Show/hide table
 | |
| Illustration 1 | g00496362 |
- Position the sections of the main control valve together. Install eight bolts (105) .
Show/hide table
 | |
| Illustration 2 | g00496361 |
- Replace the O-ring seals on ten plugs (104) with new O-ring seals. Install ten plugs (104) and the check valves in the back of the main control valve.
Show/hide table
 | |
| Illustration 3 | g00496360 |
- Replace the O-ring seal on plug (103) with a new O-ring seal. Install plug (103). Tighten the plug to a torque of 245 ± 20 N·m (180 ± 15 lb ft).
Show/hide table
 | |
| Illustration 4 | g00496319 |
- Install O-ring seal (97) and backup ring (96) on the valve (94) .
Show/hide table
 | |
| Illustration 5 | g00496318 |
Show/hide table
 | |
| Illustration 6 | g00496317 |
Show/hide table
 | |
| Illustration 7 | g00496315 |
- Install valve (99), piston (101), spring (98) and spring (100) on the lower housing. Install lower housing (102) .
- Install O-ring seal (95). Install valve (94). Tighten the valve to a torque of 74 ± 5 N·m (55 ± 4 lb ft).
- Install O-ring seal (33) and backup ring (32) on valve (27) .
Note: Use the following procedure to assemble four valves (92).
Show/hide table
 | |
| Illustration 8 | g00375398 |
Show/hide table
 | |
| Illustration 9 | g00496278 |
- Install valve (39) in sleeve (40). Install springs (34) and (38) .
- Install backup ring (36) and O-ring seal (35) on the sleeve. Install sleeve (40) in valve (37) .
- Install O-ring seals (30) and (31). Install lower housing (29) on valve (27) .
- Replace the O-ring seal on plug (93) with a new O-ring seal. Install plug (93) .
Show/hide table
 | |
| Illustration 10 | g00496314 |
- Install four valves (92). Tighten the valves to a torque of 74 ± 5 N·m (55 ± 4 lb ft).
Show/hide table
 | |
| Illustration 11 | g00496313 |
- Use the following procedure to assemble the spool assemblies.
- Install retainer (82), spring (79), spring (83), retainer (80), and bolt (81) on the spool assembly.
- Tighten bolt (81) to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 12 | g00496308 |
- Install right boom spool (89) .
Show/hide table
 | |
| Illustration 13 | g00496312 |
- Replace O-ring seal (90) with a new O-ring seal.
Show/hide table
 | |
| Illustration 14 | g00496311 |
- Install pressure switch (88). Install two socket head bolts (87) and housing (89). Tighten socket head bolts (87) to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 15 | g00496310 |
- Replace the O-ring seals on housing (84) with new O-ring seals. Install housing (85) and four socket head bolts (84). Tighten socket head bolts (84) to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 16 | g00496309 |
- Replace the O-ring seal in fitting (86) with a new O-ring seal. Install fitting (86).
- Install spool assemblies (77) .
Show/hide table
 | |
| Illustration 17 | g00496307 |
Show/hide table
 | |
| Illustration 18 | g00496306 |
Note: Make sure that the spool assemblies are installed in the spool assembly's original location. Failure to install the spool assemblies in the spool assembly's original location will result in incorrect operation of the main control valve.
- Replace O-ring seals (76) with new O-ring seals. Install eight housings (75). Tighten the bolts for the eight housings to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 19 | g00496305 |
Show/hide table
 | |
| Illustration 20 | g00496304 |
- Install backup ring (70), O-ring seal (71), O-ring seal (69), backup ring (68), backup ring (72), O-ring seal (73) and backup ring (74) .
Show/hide table
 | |
| Illustration 21 | g00496303 |
Show/hide table
 | |
| Illustration 22 | g00496302 |
- Install valve (67) .
- Install four O-ring seals (66) in housings (62) .
Show/hide table
 | |
| Illustration 23 | g00496300 |
Show/hide table
 | |
| Illustration 24 | g00496301 |
- Replace the O-ring seal that is on coupler (64) with a new O-ring seal. Install coupler (64) .
Show/hide table
 | |
| Illustration 25 | g00496299 |
- Install two housings (62). Tighten socket head bolts (63) to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
- Replace the O-ring seal on plug (65) with a new O-ring seal. Install plug (65) .
- Replace two O-ring seals (61) with new O-ring seals. Install snap ring (60) and housing (55) .
Show/hide table
 | |
| Illustration 26 | g00496298 |
Show/hide table
 | |
| Illustration 27 | g00496296 |
- Install O-ring seal (57), spring (59), valve (56) and spring (58) on housing (55) .
Show/hide table
 | |
| Illustration 28 | g00496295 |
- Install fitting (54) .
Show/hide table
 | |
| Illustration 29 | g00496290 |
- Replace the O-ring seal on plug (53) with a new O-ring seal. Install plug (53). Install spring (52) .
Show/hide table
 | |
| Illustration 30 | g00496292 |
- Install four O-ring seals (51) on housing (49) .
Show/hide table
 | |
| Illustration 31 | g00496288 |
- Install housing (49). Tighten four socket head bolts (46) to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 32 | g00496286 |
- Replace the O-ring seal that is on fitting (48) with a new O-ring seal. Install fitting (48) .
- Install spool (47) .
Show/hide table
 | |
| Illustration 33 | g00496284 |
- Install spring (44), spring (46) and rod (43) in the main control valve.
Show/hide table
 | |
| Illustration 34 | g00496283 |
Show/hide table
 | |
| Illustration 35 | g00496282 |
- Install O-ring seal (45) on cap (42). Tighten cap (42) to a torque of 74 ± 5 N·m (55 ± 4 lb ft).
- Install O-ring seal (41) on plug (28) .
Show/hide table
 | |
| Illustration 36 | g00496280 |
- Install O-ring seal (33) and backup ring (32) on valve (28) .
Show/hide table
 | |
| Illustration 37 | g00496279 |
Show/hide table
| | |
| Illustration 38 | g00496278 |
Show/hide table
 | |
| Illustration 39 | g00496276 |
- Install valve (39) in sleeve (40). Install springs (34) and (38) .
- Install backup ring (36) and O-ring seal (35) on the sleeve. Install sleeve (40) in valve (37) .
- Install valve (37) .
- Install lower housing (29) on valve (27) .
- Install O-ring seals (30) and (31) on valves (28) and (29). Install two valves (27) .
- Install plug (28). Tighten the plug to a torque of 74 ± 5 N·m (55 ± 4 lb ft).
- Install O-ring seal (26) on housing (23). Install housing (23) and bolts (25). Repeat for remaining six housings (24). Tighten the socket head bolts to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 40 | g00496275 |
Show/hide table
 | |
| Illustration 41 | g00496274 |
Show/hide table
 | |
| Illustration 42 | g00496273 |
- Install O-ring seal (21), poppet (19), spring (22) and valve (20) on plug (18) .
Show/hide table
 | |
| Illustration 43 | g00496272 |
- Install two valves (18) on each end of the main control valve. Tighten the valve to a torque of 74 ± 5 N·m (55 ± 4 lb ft).
Show/hide table
 | |
| Illustration 44 | g00375314 |
- Replace the O-ring seals on two plugs (17) with new O-ring seals. Install two plugs (17). Tighten the plugs to a torque of 162 ± 15 N·m (120 ± 11 lb ft).
- Replace the O-ring seals on two plugs (16) with new O-ring seals. Install two plugs (16) .
Show/hide table
 | |
| Illustration 45 | g00375312 |
- Install spring (14) and valve (15). Replace the O-ring seals on plug (11) with new O-ring seals. Install plug (11) .
Show/hide table
 | |
| Illustration 46 | g00375295 |
Show/hide table
 | |
| Illustration 47 | g00375294 |
Show/hide table
 | |
| Illustration 48 | g00375292 |
- Install spring (12) and valve (13) on the valve body. Replace the O-ring seals on five plugs (10) with new O-ring seals. Install five plugs (10) on the front of the main control valve. Tighten the plugs to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
- Install ball (9), retainer (8) and spring (7) in the main control valve.
Show/hide table
 | |
| Illustration 49 | g00375199 |
- Replace the O-ring seal on plug (6) with a new O-ring seal. Install plug (6). Tighten the plug to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 50 | g00375198 |
- Replace the O-ring seals on two plugs (4) and plug (5) with new O-ring seals. Install two plugs (4) and plug (5). Tighten the plugs to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 51 | g00375197 |
- Replace O-ring seals (3) with new O-ring seals. Install the various fittings (2) on the main control. Tighten the fittings to a torque of 27 ± 2 N·m (20 ± 1 lb ft).
Show/hide table
 | |
| Illustration 52 | g00375196 |
- Install the remaining ten hydraulic hoses (1) on the main control valve.
Show/hide table
 | |
| Illustration 53 | g00375193 |
End By: Install the main control valve. Refer to Disassembly and Assembly, "Main Control Valve - Install" in this manual.
Caterpillar Information System:
Air Conditioning and Heating R134a for All Caterpillar Machines Refrigerant Expansion Valve - Remove and Install
301.5, 301.6 and 301.8 Mini Hydraulic Excavators Safety Messages
M312 Excavator Machine System Boom Cylinder
M312 Excavator Machine System Stick - 3.0 m (9.84 ft)
M312 Excavator Machine System Stick - 2.6 m (8.53 ft)
315B Excavator Machine Systems Final Drive and Travel Motor - Install
315B Excavator Machine Systems Final Drive and Travel Motor - Remove
315B Excavator Machine Systems Main Control Valve - Disassemble
322B Excavator Hydraulic System Piston Pump (Main) - Test
315B Excavator Machine Systems Main Control Valve - Install
315B Excavator Machine Systems Final Drive and Travel Motor - Assemble
M312 Excavator Machine System Stick - 2.3 m (7.55 ft)
312B, 320B, 322B, 325B, 330B and 345B Excavators Air Conditioning and Heating Systems with R-134a Refrigerant Control Panel (Air Conditioner and Heater)
M312 Excavator Machine System Boom Cylinder
312B Excavator Attachments One-Way Hydraulic Flow Operation
M312 Excavator Machine System Boom Cylinder
Air Conditioning and Heating R134a for All Caterpillar Machines Refrigerant Compressor - Remove and Install
M312 Excavator Machine System Stick Cylinder
312B, 320B, 322B, 325B, 330B and 345B Excavators Air Conditioning and Heating Systems with R-134a Refrigerant Control Module - Main Control Module - Heater/Air Conditioner Unit
M312 and M315 Excavators Boom, Stick and Bucket Operation
312B, 320B, 322B, 325B, 330B and 345B Excavators Air Conditioning and Heating Systems with R-134a Refrigerant Speed Control - Resistor and Relays for Controlling Fan Speed
311B and 312B Excavators Hydraulic System Operational Checks - 311B
M312 Excavator Machine System Bucket Cylinder
312B, 320B, 322B, 325B, 330B and 345B Excavators Air Conditioning and Heating Systems with R-134a Refrigerant Air Conditioning and Heating System Schematic