Pump Replacement - Yamaha PW3028A Service Manual

PUMP REPLACEMENT

TRIPLEX PLUNGER PUMPS
Removal:
There are instances where replacing the pump may be
less repair hours than trying to determine what is the
problem. Follow these basic steps to remove any 4-bolt
style, direct-drive pump.
 Remove four bolts and lock washers holding pump
to engine. Not all pumps use lock washers. Keep
this hardware for new pump installation if the
condition is acceptable.
 Slide pump away from engine shaft. Keep the small
rectangular shaft key to reuse on new pump.
I nstallation:
Before installing the pump, it is best to apply a copper
based antiseize compound to the engine shaft. This
allows easier removal of the pump from the engine in
the future.
 Hold rectangular shaft key in place on the engine
shaft keyway.
 Align keyway of pump shaft with engine shaft
keyway.
 Slide pump onto engine shaft.
 Insert hex head bolts through lock washers (if
applicable), then through the mounting holds of
the pump.
 Hand tighten. Make sure mounting area of the
pump is all the way against mounting pads of the
engine, then tighten four bolts. Check torque chart
for proper torque.
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