12
PUMP MAINTENANCE

Pump Chamber Flushing

With the engine stopped, the pump case should be flushed after each
use to prevent sediment from building up in the case.
1. Disconnect the suction and discharge hoses.
2. Insert a garden hose into the suction side of the pump. Turn on the
water and thoroughly flush sediment out the discharge side.
3. After flushing, lift the suction side of the pump and allow water to
drain out the discharge side.

Pump Hoses and Strainer

1. Check both hoses to make
sure they are not torn or
cracked. It is especially
important that there are no
tears in the suction hose.
Tears or air leaks on the
suction side will prevent the
pump from priming properly.
2. Inspect the suction hose
sealing washer to make sure
it is in good condition.
3. Inspect the strainer to be
sure it is not plugged or
damaged.

Grease the Pump Connecting Rod

1. Remove the plastic
access plug.
2. Disconnect the spark
plug cap (page 10) and
pull the starter grip until
the grease fitting is
visible in the access
opening.
3. Wipe the grease fitting
clean to prevent dirt
from getting into the
bearing. Using a
manual grease gun,
pump one or two
strokes of NLGI #2
general purpose grease
into the bearing.
4. Reinstall the access plug securely.

Pump Gear Box Oil Change

1. Run the engine for 10 minutes to warm up the gear box oil. Warm
oil drains quickly and completely.
2. Shut off the engine.
3. Remove the two 8 x 15 mm bolts and washers from the connecting
rod cover and remove the cover.
4. Remove the drain bolt and drain the gear oil from the gear box.
5. Replace the drain bolt washer and reinstall the drain bolt.
6. Fill the gear box to the upper limit on the oil filler cap/dipstick.
Screw the dipstick in to measure the oil level.
Recommended oil: SAE 80W/90 GL5 Gear oil
7. Dispose of the used oil properly (page8).
8. Reinstall the connecting rod cover.
NOTICE
Avoid getting gear oil on the diaphragm. Drain the oil into a drain
pan to prevent oil from running down the pump case onto the
diaphragm. If gear oil comes in contact with the diaphragm, the
diaphragm will be damaged.

Pump Gear Box Oil Check

With the pump cold and on a level surface, remove the oil filler
cap/dipstick. The oil level should be just below the UPPER LIMIT
mark on the dipstick. Screw the dipstick in to check the oil level.
GARDEN
HOSE
SUCTION
SIDE
DISCHARGE
SIDE
STRAINER
SEALING
WASHER
SUCTION
HOSE
PLASTICACCESS
PLUG
CONNECTING
ROD COVER
8 x 15 mm
BOLT (2)
OIL FILLER CAP/
DIPSTICK
8 mm
WASHER (2)
UPPER LIMIT
OIL FILLER CAP/
DIPSTICK
WASHER
WASHER
DRAIN BOLT
LOWER LIMIT