
Seite 16 von 18 WH-1, WH-2, WH-3, WH-4
11.3 Uncoupling pump and cylinder or device
Before uncoupling the pump from the cylinder, make sure (by opening the drain valve) that there is no pressure and that the piston is
completely retracted or the device has come to rest according to the operating instructions
.
Remount the protection caps after uncoupling in order to avoid pollution of the coupling parts. Close the oil reservoir filler cap, so that
no oil is spilled during transport.
12 Servicing and Maintenance
For safety reasons, the operating pressure must be checked after approx. one month. Despite accurate factory settings and testing,
the max. operating pressure that can be achieved can change after start-up of the device. If there are any deviations from the
tolerance (operating pressure) specified in section 16, either readjust the pressure valve according to section 4, or contact an
authorised dealer or the customer service.
The first oil change should be carried out after six months upon completion of a pressure check. If the contact pressure deviates from
the nominal pressure specified in the operating instructions, the pressure valve must be adjusted by an authorised dealer or the
customer service.
The oil must be changed once per year. In case of frequent use or operation in particularly dusty
environment, oil should be changed every six months. Further, it is mandatory to clean the oil sieve in the oil container of the pump
each time the oil is changed.
12.1 Adding Oil to the Pump
Warning: Always add oil with cylinders fully retracted (extended if pull cylinders) or the system will contain more oil than the
reservoir can hold.
- Remove vent/fill cap from reservoir,
- Only fill the oil to approx. 2.0-2.5 cm below the upper edge of the oil container (depending on the size of the container),
- Remove air from system if necessary. See 8.3. Recheck oil level after removing air,
- Return vent/fill cap to proper position.
- Make sure no dirt gets into the oil reservoir or into the pump, as this will cause malfunction.
- To extend pump life and improve performance, lubricate the beam pin A, cross pin Band piston head Cregulary, using roller
bearing grease. See cover page.
13 Transport
13.1 WH-1, WH-2, WH-3, and WH-4 hand pumps
For transport, the lever and the bolting device has to be a locking position. The lever can be used as a carrying handle.
14 Troubleshooting
If the defects cannot be repaired, contact an authorised dealer or the service department. The address:
or Weitner themselvesor other cylinder damage
Have cylinder serviced by a authorised dealerCylinder retraction spring brockennormal
Use larger diameter hydraulic hoseHose I.D. too narrowslowly than
Remove air according to the instructions 8.3Air trapped in systemretracts more
Check that all couplers are fully tightenedLoose hydraulic couplerpart way, or
Drain oil level to full mark. See 12.1 instructions for adding oilPump reservoir is over-filledretract, retracts
Open drain valveDrain valve closedCylinder does not
Have pump serviced by a authorised dealer or Weitner themselvesInternal leakage in pumppressure
authorised dealer or Weitner themselvesdoes not hold
Locate leak(s) and have equipment serviced byLeaking sealsadvances, but
Check that all connections are tight and leak freeLeaking connectionCylinder
authorised dealer or Weitner themselves
Check for damage to cylinder; have cylinder by aCylinder plunger binding
Remove air according to the instructions on page 8.3Air trapped in systemspurts.
Do not attempt to lift more than rated tonnageLoad is too heavyor advances in
Check that all couplers are fully tightenedLoose hydraulic coupleradvances slowly,
Drain valve closedDrain valve openadvance,
Add oil according to the Maintenance instructions on 12.1Oil level in pump reservoir is lowCylinder does not
SolutionPossible CauseProblem
or Weitner themselvesor other cylinder damage
Have cylinder serviced by a authorised dealerCylinder retraction spring brockennormal
Use larger diameter hydraulic hoseHose I.D. too narrowslowly than
Remove air according to the instructions 8.3Air trapped in systemretracts more
Check that all couplers are fully tightenedLoose hydraulic couplerpart way, or
Drain oil level to full mark. See 12.1 instructions for adding oilPump reservoir is over-filledretract, retracts
Open drain valveDrain valve closedCylinder does not
Have pump serviced by a authorised dealer or Weitner themselvesInternal leakage in pumppressure
authorised dealer or Weitner themselvesdoes not hold
Locate leak(s) and have equipment serviced byLeaking sealsadvances, but
Check that all connections are tight and leak freeLeaking connectionCylinder
authorised dealer or Weitner themselves
Check for damage to cylinder; have cylinder by aCylinder plunger binding
Remove air according to the instructions on page 8.3Air trapped in systemspurts.
Do not attempt to lift more than rated tonnageLoad is too heavyor advances in
Check that all couplers are fully tightenedLoose hydraulic coupleradvances slowly,
Drain valve closedDrain valve openadvance,
Add oil according to the Maintenance instructions on 12.1Oil level in pump reservoir is lowCylinder does not
SolutionPossible CauseProblem