Use and Care Manual

Plunger Pumps
Operating Instructions and Parts Manual RMV Series Pumps
Installation
1. Install the shaft key into the keyway
and apply a light coating of anti-
seize on the engine shaft and key.
2. Align the two key ways and push
the pump completely onto the
engine.
3. Install all
four (4) bolts
and tighten
evenly. (See
fi gure 2)
4. Install the
appropriate
water inlet and discharge fi ttings.
5. Connect the water supply hose and
high-pressure discharge hose/spray
gun.
6. Turn on the water supply.
7. Open the spray gun to purge the
system of any air.
8. Start the engine.
9. If necessary adjust the engine speed
and unloader valve.
Figure 2
Service Pumps
Servicing the Valves
Discharge Valves:
Disassembly:
1. Remove the valve
cap (See fi gure 3).
2. Inspect the valve
cap O-ring for any
damage, replace if
necessary.
3. Using a needle nose
pliers remove the
valve. (See fi gure 4)
4. Use a small probe to
move the poppet up
and down to assure that
it is functioning properly.
5. Inspect for any debris that may be
lodged between the poppet and
seat.
6. Remove the valve seat O-ring and
inspect for any damage.
Assembly:
1. Install the valve seat
O-ring squarely into the
bottom of the manifold.
(See fi gure 5)
2. Insert the valve assembly
squarely into the port
pushing it into the O-ring.
Figure 3
Figure 5
Figure 4
Plunger Pumps
Operating Instructions and Parts Manual RMV Series Pumps
Symptom Possible Cause(s) Corrective Action
Oil leak between
crankcase and pump-
ing section
Worn rod oil seals Replace crankcase piston rod
seals
Frequent or prema-
ture failure of the
packing
1 Cracked, damaged or worn
plunger
1 Replace plungers
2 Overpressure to inlet
manifold
2 Reduce inlet pressure
3 Material in the fl uid being
pumped
3 Install proper fi ltration on pump
inlet plumbing
4 Excessive pressure and/or
temperature of fl uid being
pumped
4 Check pressures and fl uid inlet
temperature; be sure they are
within specifi ed range
5 Running pump dry 5 Do not run pump without water
Pump runs but pro-
duces no fl ow
Pump is not primed Flood suction then restart pump
Pump fails to prime Air is trapped inside pump Disconnect discharge hose from
pump. Flood suction hose,
restart pump and run pump until
all air has been evacuated
Pump looses prime,
chattering noise,
pressure fl uctuates
1 Air leak in suction hose or
inlet
1 Remove suction line and inspect
it for a loose liner or debris
lodged in hose. Avoid all unnec-
essary bends. Do not kink hose
2 Clogged suction strainer 2 Clean strainer
Low pressure at
nozzle
1 Unloader valve is by-pass-
ing
1 Make sure unloader is adjusted
property and by-pass seat is not
leaking
2 Incorrect or worn nozzle 2 Make sure nozzle is matched
to the fl ow and pressure of the
pump. If the nozzle is worn,
replace
3 Worn packing or valves 3 Replace packing or valves
Pressure gauge fl uc-
tuates
1 Valves worn or blocked by
foreign bodies
1 Clean or replace valves
2 Packing worn 2 Replace packing
Low pressure 1 Worn nozzle 1 Replace with nozzle of proper
size
2 Belt slippage 2 Tighten or replace with correct
belt
Troubleshooting