4. OPERATION
WARNING! Before lifting ensure Section 1 Safety Instructions are followed strictly.
4.1. Before using the jack, purge the hydraulic system, in order to eliminate any air that may
have accumulated during transit, referring to g.1 as follows:
a) Fit jack handle over release valve (1) and turn anti-clockwise to open valve.
b) Insert jack handle into the handle sleeve (2) and pump several times to ensure full
internal lubrication and to bleed air from the system.
c) Fit jack handle back over the release valve (1) and turn clockwise to close.
WARNING! Ensure you prepare vehicle and use jack according to Section 1
4.2. Safety Instructions.
4.2.1. Check that the ground upon which the jack will stand is level and solid.
4.2.2. Position the jack saddle (4) under the vehicle manufacturer’s recommended lifting
point. Position jack so as to avoid having to operate it from under the vehicle and so
that the handle can be moved up and down without hitting any part of the vehicle.
4.2.3. Using the screw extension as necessary, raise the saddle to the lifting point. Ensure
that the saddle is centred correctly beneath the lifting point.
4.2.4. Pump the handle up and down using the full stroke until the required lift is achieved.
4.2.5. Should the jack become overloaded, a safety overload valve will open, and stop the
vehicle from lifting.
4.2.6. Lower the vehicle onto suitable axle stands before attempting any work.
4.3. Lowering
4.3.1. Ensure that the axle stands are removed and that there are no persons or obstacles
beneath the vehicle, or in the path of its descent.
4.3.2. The lowering speed is controlled by the amount the release valve (1) is opened. Turn
valve anti-clockwise and lower slowly and carefully.
5. MAINTENANCE
IMPORTANT: Only fully qualied personnel should attempt maintenance or repair.
WARNING: DO NOT use brake uid, or any uid other than Sealey hydraulic jack uid (Part No: HJO500MLS or HJO5LS), as to do
so may cause serious damage to the jack and will invalidate the warranty!
5.1. When the jack is not in use, the ram and piston must be in their lowest positions to minimise corrosion. Remove the handle to
secure the jack.
5.2. Keep the jack clean and lubricate all moving parts with acid free oil on a regular basis.
5.3. To check oil level, lower the jack fully. Remove ller plug. The correct oil level is to the bottom of the ller opening.
5.4. After a year of extensive use, the oil should be replaced in order to extend the life of the jack. Drain the oil through the ller plug
opening. Make sure that no dirt is allowed to enter the jack or the fresh oil.
5.5. To replace the oil, ll as required. Pump (unloaded jack) 5 or 6 times to expel air. Pump jack to full height and pour off excess oil
before retting plug.
Note: Ensure waste oil is disposed of in accordance with local authority regulations.
5.6. Before each use check for broken, cracked, bent, or loose parts. Also check for any visible damage to welds, ram, pump, body and
base.
If any suspect item is found, remove jack from service and take the necessary action to remedy the problem.
8DO NOT use the jack if believed to have been subjected to abnormal load or shock. Inspect and take appropriate action.
5.7. Check the pump piston and piston rod periodically for signs of corrosion. Clean exposed areas with a clean oiled cloth.
Owing to their size and weight, hydraulic products should ideally be repaired by local service agents. We have service / repair
agents in most parts of the UK. Before returning your product please call our technical helpline on 01284 757505 for advice and
trouble shooting guidance. If the jack is under guarantee please contact your stockist..
6. TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE REMEDY
Jack will not lift
the load 1) Overloaded
2) Oil level low
3) Release valve not correctly closed
4) Air in system
5) Packing worn or defective
1) Be sure to use jack with adequate capacity.
2) Top up oil level.
3) Check and close release valve.
4) Open release valve and air vent (if tted) and pump the handle a few times. Close
valve and re-try.
5) Return jack to authorised service agent.
Jack does not lift
high enough or
feels “spongy”
1) Oil level low
2) Worn seals
3) Air in system
4) Release valve not closed
1) Top up oil level.
2) Return jack to authorised service agent.
3) Open release valve and air vent (if tted) and pump the handle a few times. Close
valve and re-try.
4) Check and close release valve.
Jack lifts but will
not hold load 1) Release valve partially open
2) Dirt on valve seats
3) Air in system
4) Faulty seals
1) Check and close release valve.
2) Lower jack, close release valve. Pull up lifting arm to full height by hand. Open the
release valve to lower arm.
3) Open release valve and air vent (if tted) and pump the handle a few times. Close
valve and re-try.
4) Return jack to authorised service agent.
Jack will not lower
completely 1) Ram damaged
2) Air in system
3) Release valve partially open
1) Contact authorised service agent.
2) Open release valve and air vent (if tted) and pump the handle a few times. Close
valve and re-try.
3) Check and fully open release valve.
SJ Series | Issue 1 22/02/17
Original Language Version
© Jack Sealey Limited
