Hi-Force MHP100 User manual

INSTRUCTION MANUAL:
Model Series: MHP100 –MHP1000 inclusive
Hi-Force Limited –Prospect Way –Daventry –Northants NN11 8PL –United Kingdom
Tel: [phone]: Fax: [phone]: Website: www.hi-force.com
Hydrotest Pump Series: MHP100 –MHP1000
1.0 Inspection of the product upon receipt:
On receipt of the product, visually inspect the
item for any evidence of shipping damage.
Please note shipping damage is not covered
by warranty. If shipping damage is found notify
the carrier immediately and refrain from putting
the product into service. The carrier is
responsible for repair and replacement costs
resulting from damage in transit shipment.
2.0 Safety Precautions:
Read and follow all the instructions and safety
warnings carefully prior to use of the equipment.
Failure to do so could result in equipment
damage or failure of the equipment or personal
injury. Hi-Force will not be held responsible for
any damage to the equipment or personal
injury resulting from unsafe use of the product,
lack of maintenance or incorrect operation. If in
doubt on the correct usage of any Hi-Force
equipment, contact your nearest Hi-Force office
or distributor. If the operator has not been
trained on high pressure hydraulic equipment
and its safe use consult your local Hi-Force sales
office who can offer you training courses for
operators.
All operators should ensure that all necessary
personal protective equipment as specified by
their employer is worn when operating any
hydraulic equipment. Safety shoes, safety
glasses/ visor and protective gloves should be
worn at all times. All relevant risk assessments
should be completed prior to use of the
equipment.
MHP PUMP SELECTION CHART
Safety
Read this entire manual before operating the
pump.
Failure to observe the following warnings could
result in serious bodily injury.
Ensure that all equipment connected is
in good conditions and is rated for the
operating pressure of the pump
Whenever possible, use a pressure
gauge with the pump. The optional
gauge is easily fitted to the top of the
pump. See selection chart for correct
gauge
Only use hydraulic hoses in good
condition that have a safety factor on
burst pressure of 4:1.
Ensure reservoir has sufficient capacity
for the required operation.
Do not handle hoses that are
pressurised. Oil escaping under
pressure will penetrate the skin causing
serious injury.
Danger: If oil is injected under the skin consult a
doctor immediately.
Never pressurise uncoupled hose
couplers
Always wear appropriate Personal
Protective Equipment when using this
pump.
Pump
Model
Number
Maximum
Working
Pressure
(Bar)
Low Pressure
Displacement
Per Stroke
(cm3)
High Pressure
Displacement
Per Stroke
(cm3)
Optional
Pressure
Gauge Kit
MHP100
100
50
22
MHP100GK
MHP300
300
50
8
MHP300GK
MHP500
500
50
4
MHP500GK
MHP700
700
50
3
MHP700GK
MHP1000
1000
50
2
MHP1000GK

INSTRUCTION MANUAL:
Model Series: MHP100 –MHP1000 inclusive
Hi-Force Limited –Prospect Way –Daventry –Northants NN11 8PL –United Kingdom
Tel: [phone]: Fax: [phone]: Website: www.hi-force.com
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.
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.

INSTRUCTION MANUAL:
Model Series: MHP100 –MHP1000 inclusive
Hi-Force Limited –Prospect Way –Daventry –Northants NN11 8PL –United Kingdom
Tel: [phone]: Fax: [phone]: Website: www.hi-force.com
The operating lever must be stationary during
any pressure changeover.
Ensure fluid level in the reservoir does not drop
below minimum operating level. Air may be
pumped into the system if this occurs. Never
jerk the handle during use as this makes the
pump inefficient and can cause unexpected
pressure range change over. A smooth steady
action gives best results.
Each pump is fitted with an adjustable pressure
relief valve. This valve is set at the factory to the
maximum working pressure of the pump model
specified. This valve can be customer adjusted
to any desired pressure within the rating of the
pump. Details for the method of adjustment for
this valve are available on request.
2. Pressure is released by turning the Pressure
Release Valve anti-clockwise.
3. Never stand in a direct line with the
application of force or allow personnel under
loads that are not securely supported by
mechanical means.
After Operation:
1. Fully return hydraulic fluid to pump. Check
hydraulic fluid level in reservoir to prevent over
filling of the tank.
2. Keep hydraulic fluid clean. Change as
necessary and frequently if using water.
3. After heavy use, it may be necessary to
clean the filter. Before removing the filter
element from the pump, ensure that the system
is depressurised. Unscrew the filter retainer
screw shown on the pump diagram above.
Remove the filter, clean and replace.
4. It is advisable that if the system has been
used on water and the unit is to be stored for a
period of time, that the system is drained and
the pump unit flushed through prior to storage.
Troubleshooting:
No delivery:
Pump handle when operated does not
operate plunger. Incorrect assembly.
Suction valves not sealing. Remove
contaminant or replace the seals.
Relief valve seal sticking or
contaminant not enabling it to seal.
Seal failure on delivery valve
Handle drops on its own:
Suction ball is not sealing completely.
With the release valve open pump fluid
around the pump, this may dislodge
the dirt. Failing this, remove and
clean/replace both high and low
pressure suction balls
Handle rises when left:
Delivery valve is not sealing correctly.
With the release valve open pump fluid
around the pump, this may dislodge
the dirt. If this does not work remove
the optional pressure gauge if fitted or
the bolt which is in the outlet port on
the top of the pump, remove outlet
seal spacer, spring and outlet seal.
Inspect o-ring on seal and replace if
damaged. Also check the sealing face
on the pump body for damage or dirt.
Trapped air in the pump
Air in the pump will cause loss of
effective pumping stroke and will also
permit high pressure to be raised even
when the pressure selection button is in
the low pressure position.
Some possible areas where air is being
drawn into the pump are:-
1. Release valve joint washer
2. Release valve spindle seal
3. The suction pipe connection
4. Low/High Pressure changeover
valve
Under normal circumstances should any of the
above cause air to be drawn into the pump
unit it will be visible by the leakage of the fluid
medium from that area.
Service & Maintenance:
Only genuine Hi-Force spare parts should be
used in the repair or servicing of these units.
We recommend that any servicing or repair of
this equipment is only carried out by an
authorised Hi-Force repair centre.