Hi-Force MHP300 Manuel d'instruction - Page 2

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Major Pump Components

The above diagrams show where all the major

operating components of the MHP pumps are

located.

Operating Fluids:

The MHP pump is designed to operate

successfully with most hydraulic fluids, many

lubricating oils and water.

Some fluids may require specially fitted pump

seals. If in doubt please consult your Hi-Force

Distributor.

Preparation for Use:

1. Fill the reservoir with the chosen fluid, leaving

a small air space in the reservoir (1-2cm from

the top of the fluid to the filler plug.

2. MHP100 to MHP700 pumps the outlet port has

a 3/8" NPT thread. MHP1000 pumps, the outlet

port is 3/8" BSP. Only hoses with a 4:1 safety

rating on burst pressure may be used.

Hi-Force Limited – Prospect Way – Daventry – Northants NN11 8PL – United Kingdom

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

INSTRUCTION MANUAL:

Model Series: MHP100 –MHP1000 inclusive

Check hose for damage and connect it to the

pump. Always apply good quality thread

sealant or 11/2 turns of Teflon tape, taking care

NOT to allow loose ends of the tape to enter

the hydraulic system. Do not overtighten the

connections – it can lead to premature failure

or rupturing of fittings at below rated capacity.

Your Hi-Force Distributor can supply you with

the correct hoses for your pump.

3. Fit the operating lever to the pump using the

bolt and washer provided. The handle can be

fitted in many positions at 45 degree intervals.

Choose the most comfortable one for the

operator. Ensure the handle can be operated

through its entire travel range.

** A small amount of free movement of the

handle is normal and is due to the clearances

in the manufacturing processes of the working

parts of the pump. This free movement should

not be confused with loss of effective stroke

due to other causes.**

4. Occasionally the rocker shaft will need

greasing with a medium grade grease. This is

done by removing the back plate. With the

back plate off the rocker shaft can be

removed and grease applied to all surfaces.

Bleeding the System:

1. Open the release valve on the pump by

turning it anti-clockwise. Select low pressure by

pulling out the High/Low Pressure Changeover

switch. Now operate the pump through its

entire stroke slowly and smoothly at least 10

times. Stop pumping and push in the High/Low

Pressure Changeover Switch to obtain high

pressure. Again operate the pump through its

entire range slowly and smoothly at least 10

times. The pump should now be primed and

ready to use.

2. Close the Pressure Release Valve by turning

clockwise using hand pressure ONLY. Do NOT

over tighten!

Select low pressure and operate the pump

lever. When using the pump in a hydraulic

circuit or for pressure tests it may be necessary

to vent air from the circuit at the highest point

in the system. When using the pump with a

hydraulic cylinder, fully extend the cylinder,

then invert the cylinder (plunger end down)

and open the release valve on the pump to

return any air in the system to the reservoir.

Repeat bleeding operations if necessary.

Operation:

1. Start the pumping operation in low pressure

to obtain rapid advance to load. When the

operating effort reaches 52 Bars or the operator

effort becomes excessive, select High Pressure

by pushing in the pressure changeover button.