PAGE 14 — MQD2H/3H DIAPHRAGM PUMP • OPERATION MANUAL — REV. # 8 (07/31/20)
BEFORE STARTING
1. Read safety instructions at the beginning of manual.
2. Place pump as near to the water as possible, on a firm,
flat and level surface.
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.
4. The discharge hose is usually a collapsible (thin-
walled) hose, however if a thin-walled discharge hose
is not available, 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.
WARNING
DO NOT
open fill cap if pump is hot! Water inside may
be under pressure.
NOTICE
Suction and discharge hoses are available from
Multiquip. Contact your nearest dealer for more
information.
CAUTION
Transmission fluid needs to be added prior to operation.
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.
Figure 6. Handle Installation
CAUTION
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.
PUMP BASE
WASHER
BOLT
HANDLE
GEAR
BOX
SETUP
