Check Accumulator And Track Adjuster Cylinder Circuit; Check Side Frame Area - Hitachi EX1900-5 Operator's Manual

Check Accumulator and Track Adjuster Cylin-
der Circuit --- every year
CAUTION: Accumulator (1) in the track adjuster
cylinder circuit is charged with high-pressure ni-
trogen. Be sure to release pressure before servic-
ing the hose between accumulator and track ad-
juster cylinder circuit, following the procedure
shown below.
1. Loosen lock nut (4).
2. Confirm that handle (5) is sufficiently tight-
ened by turning it clockwise. Remove plug (3).
3. Slowly turn handle (5) counterclockwise to
open valve; pressurized oil escapes gradually.
IMPORTANT: Low pressure in the track adjuster cylin-
der circuit will cause damage to the track
adjuster and travel device. Be sure to
check the accumulator and adjuster cyl-
inder circuit regularly to maintain correct
circuit pressure. Consult your authorized
dealer when checking accumulator.
Check Side Frame Area --- daily
Soil or rocks stuck in the side frame area will disturb
smooth rotation of the undercarriage components such
as the lower rollers, upper rollers, sprockets or front
idlers.
Remove soil and rocks from the area every day. In addi-
tion, clean the area at least once a week.
Be sure to thoroughly clean the area in cold seasons to
prevent excessive wear of upper rollers due to freezing.
MAINTENANCE
7-112
1
M144-07-109
M146-07-081
M18C-07-050