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HP227D AND HP257D DOUBLE ACTING HAND PUMPS.

WARNING

Hi-Force hydraulic equipment operates at very high pressure!

Careful attention to the following safety precautions will help prevent personal injury

DESCRIPTION: HP227D and HP257D are two speed hand pumps suitable for use with double acting

cylinders. Switching between low pressure and high pressure operation is done automatically

ensuring the pump always operates in the most efficient way.

GENERAL

All equipment used must be rated for the same operating pressure i.e. 700 bar (10,000 psi). DO

NOT mix high and low pressure components. If in doubt, contact your local Hi-Force Distributor.

Ensure that the pump has sufficient oil capacity to operate the cylinder(s) being used.

DO NOT exceed the rated pressure of the pump or rated capacity of the cylinder. Never tamper

with the internal safety relief valve of the pump.

Whenever possible use a pressure gauge in the system to prevent overloading.

ONLY use hoses in good condition that have a safety factor on burst pressure of 4:1 and are fitted

with strain relievers at each end.

TEST, EXAMINATION AND SERVICE.

Visually inspect all equipment before use for signs of damage or wear and tear. Any defective or

suspect equipment should be repaired or replaced immediately.

All high-pressure hydraulic equipment should be thoroughly examined and proof tested by a

competent engineer at least once a year - more frequently for heavy use.

3. Ask your Hi-Force distributor about the full Hi-Force Repair facilities and the Hi-Force Test and

Examination Service - available for all makes of high-pressure hydraulic equipment.

HOSE CONNECTION.

1. Hose connections are 3/8NPT and must be properly tightened using a quality pipe thread sealant

or 1-2 turns of Teflon tape taking care NOT to allow loose ends of the tape to enter the hydraulic

system. DO NOT over tighten connections - it can cause premature failure or rupture of fittings at

below rated capacity.

2. Connect the male couplers on the hose ends to the female couplers on the cylinder. Ensure that

both halves of the coupler are completely clean so that no dirt can enter the system. Fully tighten

the two halves of the coupler by hand only – do not use tools. It is not critical which hose is

connected to the advance port and which to the retract port of the cylinder, as long as a note is

made to avoid confusion. Danger: On a double acting cylinder both cylinder ports must be

connected to the handpump.

Hi-Force Ltd. Tel: +44 (0)1327 301000 Fax: +44 (0)1327 706555. www.hi-force.com

0711

OPERATING AND MAINTENANCE INSTRUCTIONS