Manitou AETJ 43 - Page 72

69
HYDRAULIC
70
547379EN
70 (08/03/2017)
VALVE BLOCKS AND VALVES  REMOVAL
WARNING
A cylinder tted with valves may have chambers with VERY HIGH PRESSURES, higher than 100 bars (1450.38 psi) (tilting cylinder
or cylinder with rod fully retracted or extended) even after being removed. The pressures in the chambers should be released
before disassembly.
CAUTION
Ideally, this procedure should only be carried out on cylinders whose ROD is at MID-STROKE.
In order to work under optimum safety conditions, the operator must wear protective goggles, rubber gloves, and carry a rubber
sheet
Removal of a tted valve block
WARNING
In order to avoid pressurized oil leaks, the operator should position the cylinder with the contact face (1, 070  70) between the
valve block and the cylinder, vertically, and then position a rubber sheet over this face (2, 070  70).
- Secure the cylinder body in a vise.
- Loosen the xing screws of the block (3, 070  70) one after another,
by a MAXIMUM of 1/4 turn for each screw.
- Unscrew the screws by 1/4 turn WITH A SPANNER until the
pressure has been released.
Removal of a valve
- Secure the cylinder body in a vice
WARNING
In order to avoid pressurized oil leaks, the operator should position a rubber sheet (1, 070  71) over the valve seat after positioning
its wrench
Loosen the valves (2, 070  71) in turn: MAXIMUM 1/4 of a turn per
valve.
- Unscrew the valves by 1/4 turn WITH A SPANNER until the
pressure has been released.
HAUT
BAS
70 - 70
1
2
3
3
3
3
70 - 71
1
2
2