Wheeler-Rex 39300 User manual

Operating Instructions
Model 39300 and 39301
Hydrostatic Test Pump
June 2013
Dimension 14” ( 5.5cm)L x 10” (3.9cm)W x 12” (4.7cm)H
Weight 35lbs; 16kg
Capacity 4gpm / 15lpm, @60hz; 3.4gpm / 12lpm @ 50hz
Pressure 0 - 300psi (20 bar)
Motor 1/2hp 115/230V, 1725rpm @60hz, 1450rpm@50hz
Lubrication Chassis Grease
Control Adjustable pressure relief valve
Gauge Glycerin filled, 0 - 600psi (40bar)
Inlet Connection 3/4” Female garden hose
Outlet Connection 9/16 - 18 JICF Male
Pump Style Twin piston, positive displacement
Discharge Hose 1/4” NPT Male x 1-’ (3m), 4000psi (266 bar)
Hose Ends 9/16 - 18 JICF Female swivel x 1/4” Male NPT
Pressure Feed Method: (Preferred Method #1)
This is typically a residential water source with about 40 to 60 psi
1. Fill the water line (or test vessel) to be tested prior to pump connection.
2. Connect water supply hose to the garden hose inlet € connection on the pump.
3. Open valve and turn supply water on.
4. Purge the pump and pressure hose of all air.
5. Connect output (pressure) hose between pump (B) and water line (or vessel) being
tested. (Water line or test vessel should be pre-filled with water before the test pump
is attached.)
6. Turn pump on and purge water line (or vessel) of all air at the highest point of the
system. Close valve once air has been purged.
7. With pump running, bring water line (or vessel) to pressure.
8. Watch the gauge (A) while pumping. As you reach the desired pressure; turn the
valve (C) to the ‘off’ position. Motor can now be turned off. If pressure drops off,
there is a leak in the line.
Gravity Feed Method: (Preferred Method #2)
This method requires a tank with a water outlet at the bottom. The water tank’s outlet
Should be lever with or above the level of the water inlet connection on the pump. This
allows water to flow naturally into the test pump. Follow the “Pressure Feed Method” s
steps 1 through 8 (listed above).

Operating Instructions
Model 39300 and 39301
Hydrostatic Test Pump
Siphon Method
Use a clean water source
1. Fill the water line (or test vessel) to be tested prior to pump connection.
2. Fill the intake hose (not supplied, with water, then quickly place the hose into a bucket
and turn on pump. (The unit is self-priming once primed.) Continue to pump until you
see the water coming out of the outlet, with little or no air mixed with it.
NOTE: This process may take more time than one time to prime the pump.
3. Connect the output hose to the water line. Continue on with steps 5 through 7 above.
Pre-Setting Your Pump
Your pump can be pre-set to a specific pressure easily by adjusting the pressure relief valve.
1. Unscrew (counter clockwise direction) pressure relief valve (G) until it stops.
(Note: the valve assembly will not come out of the casting body).
2. Add a ball valve (not supplied with pump) to the end of the high pressure hose.
3. Follow steps 2 through 4 from the ‘Pressure Feed Method’ above.
4. As water is flowing out of the high pressure hose, turn the ball valve to the off
position.
5. Slowly start turning pressure relief valve (G) (in the clockwise direction) by ¼ turn
increments as you are pumping the handle, until you reach the desired pressure.
6. Your test pump is now pre-set. This eliminates over-pressurizing the water line (or
the vessel).
A
B
C
F
E
D
G
A Gauge
B High Pressure Hose Connection
C Isolation Valve
D Strainer / GH Washer
E Water Inlet Connection
F Handle Assembly
G Pressure Relief Valve

Troubleshooting Your Pump
Test pressure not being reached:
 Possible air in air in line (or vessel)
 Air needs to be purged from system.
 Check garden hose strainer-washer (D) for cracks. Make sure to have a good
tight seal.
 Remove pump from system and follow steps 1 thru 6 of the “Pre-Setting Your
Pump” section.
 If using the Siphon Method and not getting pressure. Try the ‘Pressure Feed’
or ‘Gravity Feed Method’ to ensure water is getting into the pump.
 Pressure relief valve not adjusted properly.
 Turn relief valve clockwise until it stops.
 Debris stuck under poppet not allowing proper seating.
 Remove roll pin, relief valve screw, spring and poppet. Inspect for debris
in manifold casting.
 Check valve stuck (not allowing water to flow correctly through pump)
 Remove cylinder heads and inspect check valves for debris stuck in check
valves. Replace check valves if necessary.
 Check piston for wear and piston O-rings for wear / cracks. Inspect cylinder
heads for piston wear due to worn O-rings. Replace if necessary with Wheeler
Rex repair kit PN 39350 (piston and cylinder heads not included in kit). Lightly
grease each o-ring when rebuilding.
Pump Maintenance
 Pump 50/50 antifreeze/water solution through pump after each use to avoid freezing &
check balls from sticking.
 Lubricate piston and bearing with moly-lithium grease after every 50 hours of use. (remove
handle assembly (F) to access piston and bearing.
 Pump repair kit Wheeler Rex PN 39350
 Suction Hose Wheeler Rex PN 34550
Operating Instructions
Model 39300 and 39301
Hydrostatic Test Pump
CAUTION !!!
This pump is designed for water only!!
The pump is equipped with an adjustable pressure relief valve, which helps protect the system from being over
pressurized. It can be preset by plugging the end of the hose. Turn the adjusting knob clockwise to increase
pressure and counterclockwise to decrease.

Item Part No Description Qty
1 700792 PUMP ASSEMBLY 1
2 700755 MOTOR w/ SPECIAL SHAFT 1
3 700725 HANDLE 1
4 700756 COVER PLATE 1
5 154 GRIP 1
6 7179 3/8" SPLIT LOCK WASHER 4
7 276122 3/8-16 x 1 1/2" HEX HEAD CAP SCREW 4
8 275857 5/16-18 HEX NYLON INSERT LOCKNUTS 3
9 166 5/16-18 x 3/4 HEX HEAD CAP SCREW 3
10 276362 SWITCH GUARD 1
11 221389 CORD SET 1
12 3917 HOSE 1
13 700724 CAM 1
14 276685 BEARING 1
15 276443 RUBBER FOOT 3
16 276118 1/4-20 x 1/2" FULL DOG SET SCREW 2
17 276679 SWITCH 1
18 276363 SWITCH BOOT 1
19 275716 CORD CONNECTOR 1
20 220874 NAME PLATE 1
21 276203 METAL TAK 4
22 275661 PLUG, 220V 1