IHI 55N3, Operation Manual, Page: 91 / 115

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MAINTENAN C E
500HOURS
„ „ „ „ „
Change the Return Filter
* Hot oil and components can cause personal
injury. Do not allow hot oil or components to
contact the skin.
* At operating temperature, the hydraulic tank
is hot and can be under pressure.
* To relieve the pressure from the hydraulic
oil tank, loosen the oil fill plug
c
on the
hydraulic tank.
* Remove the return filter
e
only after the
engine has been stopped and the return filter
is cool enough to touch with your bare hand.
1. Lower the bucket on the ground and stop the
engine.
2. Relieve the internal pressure from the hydraulic
oil tank by loosening oil fill plug
c
.
3. Clean the area to keep dirt out of the filter base
d
.
4. Remove the used filter
e
by filter wrench. Clean
the filter base
d
.
NOTE: This is a cartridge type element. It cannot
be reused.
5. Coat the gasket
f
of new filter with clean
hydraulic oil.
6. Install the new filter
e
by hand. When the seal
contacts the base, tighten an additional 3/4 turn
by filter wrench.
7. Start and run the engine to fill the filter. Stop the
engine. Maintain the oil level between marks on
the level gauge. Add oil if necessary.
8. Pressurize the hydraulic oil tank. After fully
extending all the cylinders and loosen oil fill plug
c
to supply air to the hydraulic oil tank, tighten
the plug again.
9. Start and operate the engine. Inspect for leaks
on the oil filter
e
.
When operation breaker works, replace the
return filter every 100 hours operation.
Replace this filter in 50 hours for the initial time
only.
Fil t e r bas e
➃
Gask e t
➂
Fil t e r
o
127
Return filter
CAUTION
Bucket position at the time of
sealing off hydraulic oil tank.