Volvo EXC210B LC Operating and installation instructions

Service Information
Document Title: Function Group: Information Type: Date:
Track motor relief valve,
replacing
Service Information 2014/6/12
Profile:
EXC, EC210B LC [GB]
Track motor relief valve, replacing
Op nbr 441-112
1. Park the machine in the service position F, see .
091 Service positions
2. When the engine is running, the hydraulic line is under high pressure. Stop the engine, and remove the residual
pressure inside the hydraulic line by the travel control lever smoothly for 3 ~ 4 times with ignition switch at "ON"
position.
NOTE!
Remove the residual pressure inside the hydraulic tank by pressing the air breather on the hydraulic tank.
3. Remove screws (1) and motor cover (2).
Figure 1
Removal, motor cover
4. Remove track motor relief valve (1).
Figure 2
Removal, relief valve
5. Install a new relief valve.
6. Check relief valve pressure of the track motor, and adjust if necessary

Service Information
Document Title: Function Group: Information Type: Date:
Track motor, disassembly Service Information 2014/6/12
Profile:
EXC, EC210B LC [GB]
Track motor, disassembly
Op nbr
Precautions






Thoroughly clean the gearbox assembly prior to disassembly.
Select a clean work area.
Match mark attached components to indicate proper positioning during reassembly.
Take care not to mix parts of sub assemblies.
Thoroughly clean all parts and the inside of the casings.
Inspect and analyze all failures.
Brake valve and motor section
1. Prior to disassembly, install the motor on a rotary work stand. Drain the hydraulic oil & gear oil.
NOTE!
Oil pan size : 4 liter, 8 liter
Figure 1
Track motor
2. Remove the relief valve from rear flange (201).
Remove O-ring (108), (109), (110) and back-up rings (111), (117) from relief valve.
NOTE!
Do not reuse O-rings after removal.

Figure 2
Relief valve, removal
3. Remove screws (243).
Figure 3
Screws, removal
4. Remove rear flange (201) from spindle (302).
NOTE!
Take care not to remove shaft (2).

Figure 4
Rear flange, removal
5. Gearbox/hydraulic motor shaft and oil seal.


Remove valve plate (9), parallel pin (241), brake springs (13) and bearing (50) from rear flange (201) and
hydraulic motor.
Remove O-rings (329) from spindle (302).
NOTE!
Do not reuse O-rings (329) after removal.
Figure 5
Bearing, removal
Brake valve
6. Counterbalance spool removal.


Remove plugs (224) from rear flange (201).
Remove O-ring (236) from plug (224).
NOTE!
Do not reuse O-ring (236) after removal.


Figure 6
Counterbalance spool, removal
Remove springs (228), the stoppers (225), and counterbalance spool (223) from rear flange (201).
NOTE!
Be careful not to damage the outer surface of counterbalance spool (223) and the sliding surface of rear
flange (201). Since rear flange (201) and counterbalance spool (223) are of the selective-fitting type,
replace them together as a kit even if only one of the two parts is damaged.
Figure 7
Plug, removal
7. Check valve removal.


Remove plugs (226) from rear flange (201).
Figure 8
Plug, removal
Remove springs (230) and check valves (227) from rear flange (201).


Figure 9
Check valve, removal
NOTE!
Be careful not to damage the seat sections of check valve (227) or rear flange (201).
Remove O-ring (237) from plug (226).
NOTE!
Do not reuse O-ring (237) after removal.
8. Two-speed valve removal.



Remove plugs (257) from rear flange (201).
Figure 11
Spool, removal
Remove spool (263) and spring (266) from rear flange (201).
Remove O-rings (295) from plugs (257).
NOTE!
Do not reuse O-ring (295) after removal.
9. Removal of internal parts.
Figure 12

Plug, removal





Remove plug (280) from flange (201).
Figure 13
Piston, removal
Remove O-ring (296) from plug (280).
Remove piston (281) from rear flange (201).
NOTE!
Take care not to damage the piston hole.
NOTE!
Since rear flange (201) and piston (281) are of the selective fitting type, replace them together as a kit.
Remove plug (282), O-ring (283), (284).
Figure 14
Plug, removal
NOTE!
Do not reuse O-ring after removal.
Remove steel balls (285) from rear flange (201).
Figure 15
Steel ball, removal
10. Relief valve removal.

Figure 16
Plug, removal






Remove plug (104) and remove sleeve (102).
NOTE!
Do not interchange the parts of the two relief valves.
Remove O-ring (110) from plug (104).
NOTE!
Do not reuse O-ring after removal.
Remove shim (105) from plug (104).
Take out spring retainer (103), spring (106), and piston (101) in that order from sleeve (102).
Remove seal (120) from piston (101).
Disassemble the other side sleeve in the same method.
NOTE!
If the parts, except O-ring (110) and seal (120) need to be replaced the relief valve must be reset on a test
bench. Therefore replace the relief valve assembly.
Figure 17
Spring retainer, removal
Figure 18
Spring, removal
Figure 19

Shim, removal
Figure 20
Relief valve piston, removal
Hydraulic motor, disassembly
11. Parking brake removal.
WARNING
Abrupt injection of compressed air may cause piston to pop out. To ensure your safety, apply a protective
cover over the piston.
Figure 21
Apply the compressed air
Remove brake piston (12) by injecting compressed air (pressure : 3~5 kgf/cm2) into the parking brake
access hole in spindle (302).


Figure 22
Brake piston, removal
Remove O-rings (35 and 39) from piston (12).
NOTE!
Do not reuse O-rings (35) (39) after removal.
12. Removal of rotary group.
Figure 23
Cylinder block, removal





Place an oil pan under spindle (302).
NOTE!
Pistons must be installed into the same bores because of wear pattern. Mark the pistons and respective
cylinder bores.
NOTE!
Before removal, hold cylinder block (4) with both hands and turn it two to three times in a clockwise and
counterclockwise direction alternately, to detach shoes (6) from swash plate (3).
NOTE!
Be careful when removing the cylinder block that the pistons and needle rollers (51) do not fall into the
spindle.
Hold cylinder block (4) with both hands, and remove it from spindle (302).
Remove swash plate (3), steel balls (67) from spindle (302).
Remove the mating plates (16) and friction plates (15) that are mounted on the outer surface of cylinder
block (4).
Remove the piston assembly (5), shoe (6)], retainer plate (7), thrust ball (8), and needle rollers (51) from
cylinder block (4).