Komatsu D31EX-21, Operation & Maintenance Manual, Page: 169 / 256

OPERATION
TROUBLESHOOTING
3-117
CONNECTING PUMP TO MACHINE
WARNING
q
Fit blocks under the tracks to prevent the machine from moving, then release the brake.
q
Immediately after the engine is stopped, all parts are at high temperature, so do not carry out the oper-
ation to install the brake release pump immediately. Wait for the temperature to go down until it is pos-
sible to touch the pump by hand.
1. Fit blocks securely under the tracks to prevent the machine from moving.
2. Remove the left floorplate.
3. Loosen locknuts (1) and (2) of the towing valve on the top
surface of the pump, then loosen valve (3) at the locknut
portion 2 turns.
4. Tighten locknuts (1) and (2) lightly to hold in position so
that it does not fall out during the towing operation.
5. To close the brake and pump circuit, remove pin (5) that is
locking lever (4) of the bypass valve, then turn lever (4) in a
downward direction until it stops (fully closed position (B)).
6. To connect the hose of the brake release pump, remove
the plug installed to port (6) of the bypass valve, then install
the quick coupler.
7. Connect the quick coupler of the brake release pump
(installed to the hose) to the quick coupler at port (6) of the
bypass valve.