Pfaff 034554030 Betriebsanleitung Seite 35

Electric Stacker with Electric Travel
English
EGV ESL EPH
8.3. Hydraulic System
Failure
Stacker does not lift the
load (pump aggregate
operates)
Stacker lifts slowly or
not at all with running
pump motor, with or
without load.
The motor pump does
not start
Lifted load is no longer
suspended
Loss of oil on
cylinder
Lifted load lowers too
slowly
Design changes under reserve!
Cause
load is too heavy, overload valve is actuated reduce the load
lowering valve does not close or valve face
is leaky due to soiling
pressure relieve valve not correctly adjusted
or valve face is soiled
hydraulic pump is defective
battery discharged or defect
battery plug is not plugged in
loose connecting cable
blown fuse
defective starter relay
abraded brushes in the pump motor or
weakened pressure springs
defective pump motor
leakage in the hydraulic system
lowering valve does not close or valve face
is leaky due to soiling
pressure relief valve (pump) is leaky (pump
turns slowly backwards.)
the sealing elements are worn out
temperature is too low - hydraulic oil is too
viscous
soiled filter for return flow (lowering valve)
F8.1.20
Remedy
clean or replace
adjust or clean valve
repair or replace hydraulic pump
charge or replace the battery
plug in the battery plug
fix connecting cable
replace the fuses
replace starter relay
replace brushes with springs
replace motor or aggregate
seal accordingly
clean or replace
clean or replace the valve
Replace sealing elements
§ Discharge the stacker or the hydraulic
system
§ Let oil flow out of the cylinder, remove
screwing
§ Dismount the cylinder.
§ Disassemble the hydraulic cylinder by
unscrewing the guide piece
§ Remove the piston guiding
§ Draw the piston rod upwards out of the
guide piece and replace the sealing
elements
Use original spare parts only
Ventilate the cylinder after reassem-
ble and oil filling
For that see 6.1.
Warm up
Clean
page 35