Inspection And Maintenance Instructions; Malfunctions And Their Causes - Pfaff HX 150 Mode D'emploi

Scissors-lift trolleys
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Inspection and maintenance instructions

Safety warning
Before inspection and maintenance work is carried out, appropriate measures should be
taken to remove all loads from the scissors-lift trolley.
Maintenance and inspection work
Check operating elements for faultless operation.
Leakage
Check condition of the travelling rollers and roller axles
Grease joints and bearings
Check all screw and bolt connections for tightness
Check functioning and turning capability of wheels and rollers
Check the set-up of the control lever and the drain valve
Check the pressure control valve (max. operating pressure 110% of nominal load)
Check hydraulic system for leakage. After 10 minutes the lifted charge may not show any
visible change in position (max. 5 mm).
Check all parts of the scissors-lift trolley for wear and replace defective parts where
necessary
Check readability of type plate.
Authorise inspection by competent technical expert *
Change oil in the hydraulic system (suck the oil out of the tank, refill with new oil) –
ventilate hydraulic cylinder-
*)
e.g. by Pfaff-silberblau after-sales service
The service life of your scissors-lift trolley is limited. Worn parts must be
renewed in good time.
Oil and lubricant recommendations
Hydraulic oil: HLP-DIN 51524 T2 ISO VG 22
Lubricant: Multipurpose lubricating grease – DIN 51825 T1 - K2K
Waste oil must be disposed of in accordance with legal provisions!

Malfunctions and their causes

Malfunction
The scissors-lift trolley
does not lift – the pump
does not work
The scissors-lift trolley
does not lift the load,
although the pump is
working perfectly
Loaded or unloaded, the
scissors-lift trolley only lifts
slowly or not at all when
the pump is actuated
Raised load is lowered of
its own accord. Oil loss on
hydraulic cylinder.
The raised load is lowered
too slowly
Lifting height is not
reached
Disposal:
After placing out of service, the scissors lift trolley parts must be disposed of or
recycled in accordance with legal provisions.
Subject to change without notice
)
Cause
Lowering lever on the handle is in the
lowering position
Insufficient oil in the tank
Load too heavy – the pressure control valve
is active
Lowering valve does not close any more or
the valve face is not sealed because of dirt
Pressure control valve displaced or valve
face soiled
Hydraulic system pump is defective
Leakage in the hydraulic system
Lowering valve does not close any more or
the valve unit is not sealed because of dirt
Incorrect valve set-up.
Sealing elements are worn
Temperature too low – the hydraulic system
oil is too thick
Insufficient oil
F06.08.031
Inspection intervals
Daily or each time
Elimination
Put the lowering lever in the pumping
position
Refill with oil (platform is lowered)
Reduce load
Clean or replace
Adjust or clean valve
Repair or replace hydraulic system
pump!
Seal!
Clean or replace
Adjust lowering valve
Replace sealing elements
Find a warmer location
Refill with oil respective make an oil
change
page 10
before use
half-yearly
annually
every 2 years