Komatsu PC88MR-10 Shop Manual page 1138

50 Disassembly and assembly
Power train system
15.Remove travel motor
1) Invert travel motor assembly (1a) so that the
travel motor faces upward.
2) Remove mounting bolts of hub (1) and work
stand [1], sling travel motor assembly (1a),
and remove it.
Travel motor assembly (1a):
85 kg
a Performance check test
After completion of the travel motor maintenance,
perform the performance check test according to
the following procedure.
1. Required instruments
No. Part name
Pressure gauge (3.43 MPa {35 kg/
1
cm 2 })
Measuring cylinder (5 l)
2
Stopwatch
3
2. Test procedure
1) Install travel motor and piping
Install the travel motor to the machine, and
set the piping. However, do not install the
track.
(For performance test (operation without
load) of the travel motor)
50-110
a Perform the piping so that a pressure
gauge (main circuit) can be installed or
drain amount of the hydraulic motor can
be measured.
a Do not tap travel motor when installing.
Gently install it by means of the bolt
holes.
2) Run-in travel motor
Selection
Low
speed
running
High
speed
running
3) Performance check test of travel motor
Preparation for running-in before test
a Perform running-in until reaching the
following temperatures
1]
Hydraulic oil temperature: 45 to 55°C
Reduction gear hub external temperature:
40 to 80°C
Check test
a Measure the following items at low speed
to determine pass or fail.
Passing standard
2]
pressure difference
Max. 1.57 MPa {16 kg/cm
Hydraulic motor drain amount
Max. 0.6 l/min. / 10 rpm
a Test result
Accepted: Track shoe can be installed.
Unaccepted: Disassemble and adjust
again.
Q'ty
2
1
1
Travel
Running
motor
Pressure
direction
speed
10 rpm
Right
No load
and left
20 rpm
Travel motor drive
2 } / 10 rpm
Running
time
1 minute
or longer
respec-
tively
PC88MR-10