Pinguely-Haulotte HA20PX, Repair Manual

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CORRECTIVE MAINTENANCE SHEET
Folio 1/2
CHANGING THE HYDRAULIC PUMP
Sheet C091
Caution!
Ensure that the oil is not too
hot.
Caution!
Close the shut-off valve if
any, otherwise, empty the
hydraulic oil tank.
Caution!
Use a container to collect oil
to prevent pollution of the
environment.
Caution!
It is essential to put the
component in slings before
dismantling/re-assembling
it.
11 - Preliminary operations
• Put the machine in the maintenance configuration (see corresponding para-
graph).
• Switch off electric power (see corresponding paragraph).
• Close the shut-off valve if any, otherwise, empty the hydraulic oil tank.
12 - Removing the hydraulic pump
• Mark and disconnect the pump hoses (1).
NB: Unscrew the hoses slowly to release residual hydraulic pressure.
• Put caps on the hoses.
• Remove the hydraulic unions (4) screwed on the pump.
• Remove the screws and washers (2) fixing the pump to the motor flange (3),
then remove the pump (5).
• Remove the split spined hub (6) by unscrewing its tightening screw (7).
• Discard the O-rings.
13 - Installing the hydraulic pump
• Equip the unions with new O-rings.
• Screw the hydraulic unions on the pump.
• Check that the circlips and spacer and in good condition and in position
inside the split spined hub.
• Lubricate then fit the split spined hub onto a new pump, until the pump shaft
comes up agains the spacer. Tighten to a torque of 83 N.m (61.21 lb.ft).
• Coat the hub’s tightening screws with normal blue loctite 243
• Install the pump on the flange and fix using fixing screws previously coated
with normal blue loctite 243 and equipped with new grower washers. Tighten
to a torque of 86 N.m (63.43 lb.ft).
• Reconnect the hydraulic hoses according to the marks made during dismant-
ling.
• Open the shut-off valve, if any.
• Check the level of the hydraulic tank and fill if necessary.
• Before starting, fill the pump pan with hydraulic oil (hole L engraved on the
pump).
14 - Additional operations
• Put the machine back in the operational configuration.
• Make several extension movements to purge the hydraulic circuit.
• Check the level of the hydraulic oil tank.
• Adjust pump flow, the load sensing pressure limiter and the main pressure
limiter (see corresponding sheet).