DOC-20230111-WA0038.

UPPERSTRUCTURE / Pump Device
Disassemble Pump Device
• Be sure to read “Precautions for disassembly and
Assembly” thoroughly on page W1-1-1 before
starting the disassembly work.
1. Remove socket bolts (3) (2 used) to remove
pliot pump (2) from cover (1).
:6 mm
2. Remove socket bolts (5) (6 used) to remove the
body (4) assembly from cover (1).
:8 mm
CAUTION: When removing cover (1),
temporary tighten bolts (M14, length 70 mm)
(2 used) shall be used. Prevent personal
injury. Spring (15) may fly off when not using
temporary tighten bolts.
3. Remove socket bolts (18) (2 used) and install 2
temporary assembly bolts (M14, length 70 mm)
there instead.
: 12 mm
4. Remove socket bolts (20) (3 used) and them
loosen and remove the temporary assembly bolts
(2 used) alternately.
: 12 mm
IMPORTANT: When removing the cover (1)
assembly, take care that control
pistons (7) (2 used) may come off.
As valve plate (24) is with cover (1),
take care not to drop it. Do not
remove knock pins (21) (2 used) and
needle bearing (22) unless
necessary.
5. Remove the cover (1) assembly and packing
(23) from housing (42). At this time the cover is
still with the cylinder (6) assembly on it. Remove
valve plate (24) from the cover.
IMPORTANT: The set flow rate of the pump may be
changed if lock nut (8) is screwed.
Do not disassemble adjusting screw
(10), the lock nut and cover (11).
6. Remove socket bolts (9) (2 used) and remove
the cover (11) assembly, shim (14) and spring
seat (12) from cover (1). Then remove spring
(15), spring (16) and spring seat (17) from
housing (42).
:8 mm
IMPORTANT: The cylinder block (29) assemblies
(25 to 34) can not be disassembled.
They shall be replaced in a set if
necessary.
7. Remove the cylinder block (29) assembly from
housing (42).
IMPORTANT: Do not remove oil seal (48) from
cover (49). The cover assembly shall
be replaced in a set if necessary.
8. Remove retaining ring (50) from housing (42),
and then remove the cover (49) assembly and
O-ring (47).
9. Tap at the shaft (43) assembly to make it come
to cover (49) from housing (42) with a plastic
hammer.
10. Remove retaining ring (44) from shaft (43).
Press bearing (45) to the side of housing (42)
from the shaft with a press to remove it.
IMPORTANT: Do not disassemble distant piece
(38), bearing (37) and bearing (35)
from hanger (36). The housing (42)
assembly shall be replaced in a set if
necessary.
11. Remove socket bolts (41) (4 used) to remove
cover (40) and O-ring (39) from housing (42).
:6 mm
W2-4-7