MP Pumps HYDRASUB 20_25 INSTRUCTION - Manual (Page 2)

CONNECTING TO THE POWER SOURCE:
The pressure and return ports are noted on the pump casting
closest to the hydraulic motor connection. Connecting the ports
in opposite orientation will result in damage to the hydraulic motor
components and lip seal. The Model 20 uses SAE #8 hydraulic
o-ring connections with a minimum hose size of .50 inches. The
Model 25 uses SAE #10 hydraulic o-ring connections with a
minimum hose size of .625 inches. Hose should be rated for
operating at 2500psi or greater.
CONNECTING TO THE PUMP DISCHARGE:
Model 20 has a 2” cam and groove connection, and Model 25 has
a 2.5” cam and groove. Attach a suitable length of hose and lock
the connector using a safety lock or wire. Do not install a discharge
valve or nozzle. The outlet must not be restricted or reduced.
LOWERING THE PUMP INTO THE HOLE:
The pump can be lowered into the hole after all connections are
made to the pump. A rope or cable can be attached to the handle
or the pump can be lowered by the hose and hydraulic lines to rest
onto a solid floor or base. If the pump is to be suspended,
support cables must be used to secure the pump from rotating and
support the weight of the discharge hose when it is full of water.
Never suspend a pump by using the hoses to hold the pump. For
best optimum pumping performance, keep the pump in an upright
position. The discharge hose must be secured at the end and at
the point where the hose exits the hole. Avoid kinks and sharp
bends to the hydraulic lines.
OPERATION:
Energize the hydraulic power source. Check and adjust the oil
flow rate if necessary. Check the discharge hose for kinks and
make sure that they are securely restrained. If adjustments to the
hoses are required, shut down the power, adjust, and then
restart. Adjusting the discharge hose during operation may
result in injury to the operator. When pumping solids, set the
pump for maximum flow to keep the solids suspended and expelled
through the discharge hose. Accumulating solids within the
discharge will reduce the flow and may cause accelerated wear to
the pump if solids backup into the pump housing. It may also
require periodic maintenance to clear the discharge hose. The
pump will clear all liquid to within .75 inches of the pump base.
Periodically clear debris that may accumulate around the pump
inlets. The pump is capable of pumping any solid material that will
fit through the strainer opening. Maintaining a low level can be
accomplished with the pump operating in air. When evacuating to
depths over 30 feet, a check valve at the pump discharge may be
used to keep the water from flowing backwards when the pump
has cleared to a low level and is pumping in air. When pumping
is completed, shut off the hydraulic supply before removing the
pump from the hole. The pump may remain in the hole after use
for long periods of time if intermittent use is required.
REPAIR:
Normal rebuild service may be required to replace the lip seals
after 3,000-6,000 hours of operation. The pump will require
complete disassembly. Any wear to the hydraulic motor parts
will require complete replacement of the hydraulic motor
assembly. Visible wear to the pump parts is not as critical as the
motor components.
HYDRASUB pumps do not require any adjustments or special
clearance settings when assembling or rebuilding.
DISASSEMBLY:
(See exploded view and parts description)
1. Remove the five cover plate screws and remove the cover.
2. Remove the three screws that hold the suction flange, and
remove the suction flange.
3. Remove the two handle screws and remove the handle.
4. Remove the four hydraulic motor screws and remove the
hydraulic motor cover, gerotor element with drive pin, and the
thrust plate.
5. Secure the impeller and unthread the impeller from the shaft
using a wrench on the flats at the ball bearing. The thread is
a left hand thread that requires opposite rotation for removal.
6. Remove the shaft and bearing assembly by first removing the
retaining ring, then apply pressure to slide the shaft and
bearing out of the motor side of the pump housing.
7. Remove the two lip seals by pushing the seals out through the
motor side of the pump body.
INSPECT THE PUMP PARTS:
Clean all foreign material off the parts. DO NOT use abrasive
cleaning methods on the hydraulic parts or shaft.
Check the motor shaft for wear at the lip seal surface. If it has
grooves greater than .003 inches deep, the shaft should be
replaced.
Check the hydraulic motor parts for wear. Any appearance of
displaced metal or surface smearing will require replacing all of
the motor parts.
Check the impeller blade surface between the impeller and the
suction flange. If the surfaces are severely worn, or the impeller
blades are bent, replace each item.
Clean the parts that are to be reused using a solvent or mild
cleaner. Remove abrasive material. Cleanliness of the hydraulic
motor parts is very important.
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