User's Manual

PAGE 16 — MQD2H/3H DIAPHRAGM PUMPS — OPERATION AND PARTS MANUAL — REV. #7 (05/24/13)
Before Starting
1. Read safety instructions at the
beginning of manual.
2. Place pump as near to water as
possible, on a firm flat, level surface.
NOTE
Suction and discharge hoses are
available from Multiquip. Contact
your nearest dealer for more
information.
4. The discharge hose is usually a collapsible (thin-walled)
hose, however if a thin-walled discharge hose is not avail-
able, a rigid suction hose can be substituted in its place.
5. Make sure the
suction strainer (Figure 2) is clean and
securely attached to the water end of the suction hose. The
strainer is designed to protect the pump by preventing large
objects from being pulled into the pump.
DO NOT open fill cap if pump is hot! Water inside may
be under pressure.
WARNING - Fill Cap
Hoses and Clamps
1. Check that all hoses are securely attached to the pump.
Make certain suction hose (Figure 2) does not have any air
leakage. Use teflon tape or pipe dope on NPT threads.
2. Remember suction hoses must be
rigid enough not to
collapse when the pump is in operation.
3. Check that the discharge hose (Figure 2) is not restricted.
Place hose so that it lays as straight as it is possible on the
ground. Remove any twists or sharp bends from hose which
may block the flow of water.
Handle Installation
The MQD2H/D3H diaphragm pumps are completely
assembled except for the steering handle. Attach the steering
handle to the pump base as referenced below:
1. Remove the two front 1/2-13 hex screws fastening gearbox
mounting feet to base as shown in Figure 6.
2. Place handle onto gearbox mounting feet. Align handle
mounting holes with front holes on gearbox feet.
3. Install 1/2" flat washers onto 1/2-13 X 2-1/4 hex screws.
4. Insert hex screws through handle and gearbox foot, into
tapped holes of base.
5. Hand tighten both hex screws.
6. Torque both hex screws to 35 ft-lb.
PUMP BASE
WASHER
BOLT
HANDLE
GEAR
BOX
Figure 6. Handle Installation
CAUTION - Transmission Fluid
Transmission fluid needs to be added prior to operation.
SETUP
Failure to follow instructions and properly install handle,
mounting screws with washers, and torque mounting
screws, will result in damage or premature failure to
gearbox, base or other pump components.
CAUTION - Handle Mounting