8
HYDRAULIC LIFTING GEAR
Disassembly and assembly
5-2
Disassembly of the pump unit
1.
Remove the pump unit from the vehicle, see
the chapter “Removal and installation”.
2.
Let the oil run from the reservoir.
3.
Clean the entire pump unit and the
surroundings before disassembly. Work in
very clean conditions.
4.
Remove the pressure-relief valve, the
4/2 valve and the 2/2 valve, see chapter
“Removal and installation”.
5.
The built-in non-return valve (28) is very
difficult to remove from the valve block
because a very strong locking and sealing
compound has been applied to the screw
thread of the sealing plug (29). Leave the
non-return valve in the valve block, if it is
not necessary to remove it.
6.
Remove the pressure switch (40).
7.
Loosen the clamping strip (19) and take the
reservoir (23) from the valve block (27).
8.
If necessary, disconnect the return lines
(35 and 45) from the valve block (27). The
lines are clamped to the couplings (36 and
44).
9.
Loosen the hose clip (48) and remove the
suction filter (50) from the coupling (47).
10. Mark the position of the pump (32) relative
to the valve block (27) to facilitate installing
the pump. Remove the two attachment bolts
(34) at the back of the pump and remove
the pump (32) from the valve block (27).
11. Mark the position of the motor (24) relative
to the valve block (27). Remove the two
hexagonal socket screws (31) and remove
the motor from the valve block.
12. Remove the coupling disk (26) from the
valve block (27).
6
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