Undercarriage And Frame; Testing And Adjusting Track Tension - Komatsu PC88MR-10 Shop Manual

30 Testing and adjusting

Undercarriage and frame

Undercarriage and frame

Testing and adjusting track tension

Testing
(PC88MR-DTL0-285-K-00-A)
1. Run the engine at low idle, drive the machine by
the length of track on ground, and slowly stop it.
2. Put a bar [1] on the track shoe between the idler
and the first carrier roller.
a Use an L shape steel bar, etc. which has few
bents for bar [1].
3. Measure maximum clearance (a) between bar
[1] and track shoe.
Standard max. clearance (a)
Road liner, iron shoe specification: 10 to 30
mm
Rubber shoe specification: 1 to 3 mm
Adjusting
(PC88MR-DTL0-27C-K-00-A)
1. When increasing the tension
1) Pump in grease through grease fitting (2) by
using a grease gun.
2) To check if the track tension is correct, run
the engine at low idle, move the machine
slowly forward by an amount equal to the
length of track on ground, then stop the
machine.
3) After finishing adjustment, check that the
tension is correct according to the preceding
procedure.
1
30-36
(ALL-DT00-001-K-00-A)
(ALL-DTL0-001-K-00-A)
2. When decreasing the tension
2
T 2 P 0 2 8 0 0
a The grease can be pumped in until
dimension (b) between the idler guide
and the track frame end becomes 0 mm.
If the tension is still loose, the wear of
pins and bushings is large. In such a
case, the pins and bushings need to be
turned 180 deg. or replaced.
1) Loosen valve (1), remove the grease, and
tighten valve (1).
There is a danger that the valve may
jump out by the internal high-pressure
grease. Do not loosen the valve more
than 1 turn.
2) To check if the track tension is correct, run
the engine at low idle, move the machine
slowly forward by an amount equal to the
length of track on ground, then stop the
machine.
3) After finishing adjustment, check that the
tension is correct according to the preceding
procedure.
PC88MR-10