7-24
Check item
Parking brake torque
Measuring method
Criteria
Allowable
Remedy
After completion of
assembly, set the torque
wrench on the shaft
end, and measure the
braking torque generat-
ed when the shaft
starts to rotate
Measure the total thick-
ness of 4 pieces of fric-
tion plate and 5 pieces
of separating plate.
92.6 kgf
余
m
(670 lbf
余
ft)
22.76 mm
82.8 kgf
余
m
(599 lbf
余
ft)
Thickness :
21.3 mm
R e p l a c e a l l o f
separator, friction
plates and springs
Replace all sepa-
rating and friction
p l a t e s a n d
springs.
Standard of replacing friction and
separating plate.
When measuring parking brake torque,
it needs to disassemble traveling unit to
motor and reduction gear portion, and
it’s so hard.
The right allowable value is a standard
of replacing friction and separating
plate.
If it is impossible to disassemble travel-
ing unit, refer to the right value.
Check item
Measuring method
Judging criteria and remedy
Shaft
Bearings
Splines
Overload relief valve
Measure the wear at contacting
surface of oil seal (3) with the
surface roughness tester
Replace bearings (10, 51) after
decided hours
Replace if the wear of splines
exceeds the allowable value
Do not try to adjust the valve,
since special hydraulic test
bench is required for inspecting
and adjusting the pressure
If the depth of shaft wear is less than 0.05 mm, the
shaft is reusable.
侍
In case of replacing the shaft (9), replace oil seal
(3) at the same time.
Replace bearings (10, 51) before hour meter of host
machine indicates 10,000 hours.
侍
In case replacing the bearings (10, 51), replace
both inner and outer races at the same time.
侍
Also the bearing shims (52) must be readjusted
when replaced shaft (9) and/or bearings (10,
51).
Contact dealers for jigs and tools required.
If the wear of splines is less than 0.3 mm, the spline is
reusable.
Replace relief valve part as an assembly each time
the host machine works for 10,000 hours.
