Clean Suction Filter - Hitachi ZW 550-6 Operator's Manual

Clean Suction Filter

--- each time the hydraulic oil is changed.
IMPORTANT: This upper tank area must be very
clean prior to beginning this procedure. Failure to
clean the top of tank may lead to hydraulic system
problems due to system contamination.
Two suction filters are located on the bottom of the
hydraulic oil tank. Clean the suction filters when changing
hydraulic oil.
1. After draining hydraulic oil, remove cover (1) with
gasket. Remove lock nuts (2) and washers (3), and
remove suction filters (4) from the oil pipe.
When removing the suction filter, take care not to
allow trapped dust to fall into tank.
IMPORTANT: A few small particles in the strainer
is normal. Large metal, rubber pieces, or a large
amount of fine particles is abnormal. If found,
contact your authorized dealer.
2. Clean the suction filter and the hydraulic oil tank
inside with cleaning solvent. Swab out cleaning oil
with a lint free cloth.
3. Install cleaned suction filters (4) to the oil pipe, and
tighten lock nuts (2) with washers (3).
m : 38 N·m (3.9 kgf·m, 28 lbf·ft)
4. Install cover (1) and a new gasket with nuts.
f
NOTE: Make sure to replace the cover gasket with new
one.
5. Fill the tank to level with the specified volume of oil
through the oil supply port. Check the oil level at the
oil sight gauge.
6. Start the engine. While slowly raising or lowering the
arm and tilting the bucket forward and backward,
check for any abnormality. Stop the engine. Check
the oil level using level gauge (5).
MAINTENANCE
7-46
5
1
4
2, 3
115Z7-7-39-1
115Z7-7-42-2