26850A002 06/04/14
2
GENERAL INSTRUCTIONS
CAUTION: Positive Displacement Pumps must have a
proper size and operable type of pressure regulating
valve or pressure relief valve piped into the discharge
line. This is mandatory to prevent damage to pump and
piping or possible injury to personnel. Do not install
any valves or shutoff devices in the by-pass line from
pressure regulator to tank or supply.
CAUTION: All pumps should be installed level. For
mobile applications the maximum angle of intermittent
operation should be no more than 5 degrees in any
one direction.
CALIFORNIA PROPOSITION 65 WARNING:
This product and related
accessories contain chemicals known to the
State of California to cause cancer, birth
defects or other reproductive harm.
BELT DRIVE
With belt drives, the pulley on both the engine and pump
should be located as close as possible to bearing to
reduce bearing and shaft bending loads. On multiple
V-belt drives, a complete set of belts should be installed
when making a replacement. Make sure that all bolts,
nuts, set screws and keys are properly tightened.
STARTING PUMP
Fill pump crankcase with recommended oil to level
mark on oil saber. Oil recommendations are covered
in lubrication section of pump instructions. Replace all
drain plugs in pump and piping. Inspect tank to be sure
that no foreign material is in tank or suction line. Fill tank
at least half full or connect suction to water supply. Open
valve (if present) in suction line. Avoid prolonged dry
operation which may cause excessive wear on cylinders
piston packing. Be sure that an operating pressure
gauge is located in discharge line. Make sure all valves,
including spray gun or nozzles, are open in discharge
line. Spray gun may be anchored to discharge back into
tank. Completely back off pressure adjusting screw on
pressure regulating valve.
After starting, close discharge valve or spray gun slowly
while watching pressure gauge to make sure relief
valve or unloader is operating properly. Adjust relief
valve or unloader to desired pressure. See regulator
instructions. Cycle nozzles, or gun, on and off to be
sure that pressure adjustment and regulator operation
is satisfactory. Nozzle capacity should not exceed 90%
of pump capacity for satisfactory regulator operation.
AVOID FREEZING by draining all water from pump and
system in cold weather.
SUGGESTED MAINTENANCE SCHEDULE
Check oil level – Daily
Drain & change oil – 300 hr.
Drain at operating temperature to prevent contamination
from settling.
Replace piston packing – 500 hr.
Inspect frequently for leakage; piston packing is allowed
to drip in order to cool and lubricate packing.
Inspect valves and springs – 500 hr.
Replace if cracks and heavy wear are present.
Inspect connecting link bearing inserts – 1000 hr.
Replace at first signs of fatigue or wear to prevent
damage to crankshaft.
Inspect crankshaft tapered roller bearings – 2000 hr.
LUBRICATION
Fill gear case with Mobilgear 630 or equal additive to
approximately 5 1/2 qts. Adjust by viewing the oil level at
mark on oil dipstick.
NOTE: After first 30 hours of operation drain oil from
gear case (preferably drain at operating temperature),
replace plug and refill crankcase with new oil. Check oil
level daily and add oil as needed.
ADDITIVES FOR CRANKCASE OIL
Use of Molybdenum Disulfide (MoS
2
) is highly
recommended as an additive to the gear case oil in
back geared pumps and speed reducers. The additive is
compatible with all known oils. It is effective in reducing
wear and friction that power train life may be doubled
between overhauls.
• Volume MoS
2
concentrate or dispersion “M”
for 5% – 9 oz.
• Volume MoS
2
concentrate or dispersion “M”
for 10% – 18 oz.
SERVICE
Disengage clutch, disconnect electrical leads to motor,
or remove spark plug leads on engine.
REPLACING PACKING
Move assembly to front end of cylinder (top dead
center). Remove valve assembly if required to provide
clearance. Remove cap screw. Retract piston rod and
insert tool. Pull packing assembly out or push by rotating
crankshaft by hand.
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