DOC-20230111-WA0038.

UPPERSTRUCTURE / Pump Device
Assemble Pump Device
• Be sure to read “Precautions for Disassembly and
Assembly” thoroughly on page W1-1-1 before
starting the assembly work.
1. Install O-ring (39) and cover (40) to housing
(42) with socket bolts (41) (4 used).
:6 mm
: 8 to 35 N⋅m
(2.9 to 3.6 kgf⋅m, 21.0 to 26.0 lbf⋅ft)
2. Install retaining ring (46) to shaft (43), and then
press fit bearing (45). Install retaining ring (44)
on the shaft.
3. Press fit the shaft (43) assembly to housing (42).
Install O-ring (47), the cover (49) assembly and
retaining ring (50) to the housing.
4. Install the cylinder block (29) assembly to
housing (42).
IMPORTANT: Apply grease to the rod portion of
hanger (36).
5. Install spring seat (17) , spring (16) and spring
(15) to the rod portion of hanger (36).
6. Install O-ring (13) and shim (14) to spring seat
(12). Then install the spring seat to cover (1).
7. Install the cover (11) assembly to cover (1) with
socket bolts (9) (2 used).
:8 mm
: 55 to 69 N⋅m
(5.6 to 7.0 kgf⋅m, 41 to 51 lbf⋅ft)
IMPORTANT: Apply the grease to the mating
surfaces of valve plate (24) and
cover (1). Align the valve plate with
knock pins (21) (2 used) and the port
hole of the cover.
8. Install valve plate (24) to cover (1).
IMPORTANT: When installing cover(1) on housing
(42), take care not to drop control
pistons (7) (2 used) and valve plate
(24).
9. Install packing (23) and the cover (1) assembly
to housing (42) with socket bolts (18) (2 used)
and socket bolts (20) (3 used).
: 12 mm
: 150 to 180 N⋅m
(15 to 18 kgf⋅m, 108 to 130 lbf⋅ft)
10. Install the body (4) assembly to cover (1) with
socket bolts (5) (6 used).
:8 mm
: 55 to 69 N⋅m
(5.6 to 7.0 kgf⋅m, 41 to 51 lbf⋅ft)
11. Install O-ring (19) to cover (1) and install pilot
pump (2) with socket bolts (3) (2 used).
:6 mm
: 28 to 35 N⋅m
(2.9 to 3.6 kgf⋅m, 21.0 to 26.0 lbf⋅ft)
NOTE: Refer to page W2-4-5 for O-ring (19).
W2-4-11