Precautions In Handling The Pump; Points To Remember When Replacing The Pump Or Using A Vacuum Pump - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
b. Precautions in handling the pump

(1) Points to remember when replacing the pump or using a vacuum pump

(Without taking the following steps, unusual noise may be heard and what's worse, the pump may get
damaged.)
Take the following procedure after replacing the pump
but before starting the engine.
1) Unclamp the air bleeder hose that comes out from
the top of the pump, and pull it toward yourself.
Press in the hex plug and the black lock as well.
Then hold the black lock and pull put the hex plug.
2) With the hex plug out, reclamp the hose back into
position.
3) Wait for 30 seconds or so in this state.
4) Insert the hex plug. (Make sure it is deep enough in
place.)
Note:
Be careful never to raise the engine rpm without the
hex plug in place. Air may sucked in, getting the
pump damaged.
5) Reclamp the air bleeder hose back into posotion.
6) Start the engine at the idling speed.
7) Try to raise the dozer at ths speed. If it is not lifted,
stop the engine, remove the plug again, and bleed
air.
8) Still at the idling speed, move the lever to the neu-
tral position. Wait until there is no cavitation noise
heard.
9) Finally increase the engine speed by about 500 rpm
step by step up to the maximum speed. Make sure
no cavitation noise is heard. Return the engine
speed back to the idling rpm. Move the arm and
bucket untill there is no cavitation noise heard. Now
again increase the engine speed by about 500 rpm,
and move the arm and bucket. Repeat this up to the
maximum engine speed and make sure no cavita-
tion noise is heard.
IV-S-37
Hydraulic system