Komatsu PC88MR-10 Shop Manual page 1126

50 Disassembly and assembly
Power train system
Part
Part name
number
Timing plate
109
115 Disc
116 Plate
105 Piston
149
Ball bearing
150
2-stage speed
161
piston assembly
162
(piston + shoe)
323
Spool
363
Assembly
(PC88MR-DF10-710-K-01-A)
Perform installation in the reverse order to removal.
1. Preparation before assembling
Prepare the same tools and equipment as the preparation items in "Disassembly" section.
2. General precautions for working
1) Same as "2. General precautions for working" in "Disassembly" section.
2) Clean all parts, remove metal particles and foreign matters, and check for burrs and damages before
assembly. If burrs or damages are found on the parts, remove them using an oil abrasive wheel.
3) Do not reuse the O-ring, oil seal, and floating seal. Replace them with new ones.
4) Pass tap (M10, P1.25) through the screw hole of the carrier shafts (4 places) of spindle (2), and
remove the remaining adhesive.
Clean the screw hole and degrease it, and then blow compressed air to dry it. Replace bolt (51) with a
new one.
5) Pass tap (M8, P1.25) through the screw hole of the shafts (3 places) of carrier (3), and remove the
remaining adhesive.
Clean the screw hole and degrease it, and then blow compressed air to dry it. Replace hexagonal
head bolt (40) with a new one.
6) When installing the O-ring, oil seal, and floating seal, lightly grease, and perform the work carefully to
prevent them from being damaged.
7) Be sure to apply power line oil (TO30) to the moving and sliding surfaces of each part of the travel
motor for assembling.
8) Do not wear cloth gloves during the assembly work.
(This is because to prevent the malfunction due to entry of particles of the cloth glove fiber)
9) Tighten the bolts and plugs. For details, see "Standard tightening torque table".
10)After completion of assembly, immediately install the plugs to all the ports to prevent dusts from
entering.
11)Illustration shown of this section is a typical model. Therefore, disassembly procedure is not changed
even if the shown parts are partially different from the actual machine.
3. Assembly procedures
a To replace and then reassemble the parts, adjustment of the bearing preload is required. Therefore,
check that the following parts have been replaced with new ones.
Hub (1)
Spindle (2)
Ball bearing (24)
a To replace the above parts and then reassemble them, be sure to use the parts "Adjustment of each
part" have been already performed. Otherwise, the travel motor malfunction or early damage may
occur.
1. Assemble hub
50-98
Phenomenon
Seizure and uneven wear is found on sliding
surface.
Both end surface is worn unevenly.
Braking torque is insufficient.
Seizure phenomenon is found.
Periphery is scratched.
Indentation is found.
Flaking phenomenon is found on the rail surface
of the bearing.
It is worn.
The periphery part is abnormally worn.
The shoe is worn abnormally and unevenly.
The shoe is worn abnormally and unevenly.
Periphery is scratched.
Standard Allowable
value value
- -
Braking Braking
torque torque
Min. 145 Nm Min. 120 Nm
{14.8 kgm} {12.3 kgm}
- -
- -
- -
- -
PC88MR-10