Hi-Force HP257D Operating And Maintenance Instructions - Page 2

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Hi-Force HP257D Operating And Maintenance Instructions
TDS1206
PUMP OPERATION.
1. The pump may be used either horizontally or vertically with the hose end downwards. Before use
unscrew the small bleed screw on the top of the tank. This will and maximise the oil volume
available. Tighten the bleed screw again before transporting the pump. The pump is equipped
with a pressure relief valve factory set at the maximum operating pressure.
2. To advance the cylinder, move the valve lever towards the hose outlet that is connected to the
advance port of the cylinder. Operate the pump handle.
3. To prevent accidental operation, centralise the valve lever when the cylinder is in the desired
position.
4. To retract the cylinder move the valve lever towards the hose outlet that is connected to the
retract port of the cylinder. Operate the pump handle.
5. WARNING: DO NOT RELY ON THE PUMP VALVE FOR POSITIVE LOAD HOLDING. IF IT IS
REQUIRED TO LOCK THE LOAD IN POSITION USE A MANUAL SHUT OFF VALVE OR
PILOT OPERATED CHECK VALVE IN THE CIRCUIT. NEVER WORK UNDER A LOAD
SUPPORTED ONLY BY HYDRAULIC MEANS.
FILLING WITH OIL.
Ensure cylinder is full retracted.
HP227D: Position pump vertically with pump head downwards. Remove central plug on rear of pump
and check oil level using dipstick fitted to plug.
HP257D: Position pump horizontal on a flat surface remove plug on the top of the tank and check oil
level with dipstick on plug.
BLEEDING THE HYDRAULIC SYSTEM.
Connect a cylinder to the pump. Position the cylinder below the level of the pump with its pressure
ports uppermost. Ensure the bleed screw on the pump is open. Operate the cylinder 3-4 times over
its full stroke and all air should be forced back to the pump reservoir. Warning: when using a small
cylinder with long hoses it is possible that air can remain trapped in the hose if the volume of the hose
is greater than the volume of the cylinder. In this case the bleeding must be carried out using a
shorter hose before use.
Hi-Force Ltd. Tel: +44 (0)1327 301000 Fax: +44 (0)1327 706555. www.hi-force.com
0711