26850A005
2
INSTRUCTIONS
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 shut-off devices in
the bypass line from pressure regulator to the tank
or supply.
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.
It is recommended to install a pulsation dampener in
the discharge line to smooth out pressure pulse. This
can protect pump parts and piping for longer life and
quieter operation.
BELT DRIVE
With belt drives, the pulley on both the engines and pump
should be located as close as possible to the bearing to
reduce bearing and shaft bending loads. Make sure that all
bolts, nuts, set screws and keys are properly tightened.
STARTING PUMP
Fill pump crankcase with recommended oil (SAE 30) to
the level mark on the oil saber. 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 piston packing. Be sure that an
operating pressure gauge is located in discharge line. Use
a heavy duty, liquid filled, pulsation-free pressure gauge.
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 device on the pressure regulating valve. Check
pressure rating for pulsation dampener pressure regulator
and pipe fitting to make sure working pressure is not over
maximum pressure rating.
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. 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 the pump and
system in cold weather. There is a 3/8 NPT drain plug for
each cylinder chamber.
SUGGESTED MAINTENANCE SCHEDULE
Check oil level – Daily
Drain and change oil (SAE 30) – 300 hrs.
Drain at operating temperature to prevent contamination
from settling.
Inspect piston packing and spacer rings – 500 hrs.
Inspect frequently for leakage; piston packing is allowed to
drip in order to cool and lubricate packing. Replace if there
is a stream leak.
Inspect valves and springs – 500 hrs.
Replace if cracks and heavy wear are present.
Inspect connecting link bearing inserts – 1000 hrs.
Replace at first signs of fatigue or wear to prevent damage
to crankshaft.
Inspect crankshaft tapered roller bearings and
piston stud – 2000 hrs.
Replace if there is any pitting on the seal surface or if the
surface is rough.
LUBRICATION
Pump
– Fill crankcase with 2 qts of oil. Maintain oil level
between the high and the low level marks on bayonet oil
gauge inserted through the crankcase cover. Add extra
quart for crankshaft speeds under 300 rpm.
Drain oil from crankcase after first 30 hours of operation.
Refill with proper oil. Check oil levels regularly. Change oil
immediately if water droplets are found on bayonet gauge.
SERVICE
Disconnect electrical leads to motor or remove spark plug
leads on engine before proceeding.
REPLACING PISTON PACKING
Loosen cap screw to remove piston assembly through the
cylinder opening. Use waterproof grease to lubricate piston
packing and O-ring on cylinder caps.
REPLACING VALVE SEATS
Pass head of puller through the hole in the valve seat
before the sliding piece is inserted alongside the puller
bolt. Place valve cap clamp on the puller bolt along with the
nut for extracting the valve seat. Place the new valve seat in
the tapered hole in the cylinder body and place a soft brass
rod against valve set and drive into place. Do not use a hand
or arbor press as it may crack the cylinder body.
REPLACING CYLINDER LINERS
Remove piston packing and rotate crankshaft until the
piston rod is in rear position. Insert puller through the
inside of cylinder and insert disc into the slots on the
puller. Slip plate over the threads on the puller and screw
the nut on the thread in the puller. Tighten nut until the
liner breaks loose and then loosen nut and slip disc out of
slots. Remove puller and repeat to remove remainder of
cylinder liners.
Clean out any accumulation of loose rust or corrosion in
tapered cylinder. Inspect O-ring and replace it if damaged.
Insert liner into position by hand then firmly drive in. Never
use a hand or hydraulic arbor press as it may shrink the
liner.
REPLACING PISTON ROD SEALS
The rod seal assembly contains two seals and two oil seals
with lips facing power end. The oil seal can be replaced
without taking the fluid end off by removing the cylinder
