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Flexible Pump Coupler
The flexible pump coupler is a nylon “spider” insert, located
between the pump and the engine shaft. Over time, the coupler
will harden and deteriorate. Replace the coupler if you detect
vibration or noise coming from the area between the engine and
the pump. If the coupler fails completely, you will experience a
loss of power.
NOTE: Never hit the engine shaft in any manner, as a blow will
cause permanent damage to the engine.
Remove three nuts that secure the pump to the coupling 1.
shield. Two nuts are at the bottom corners and one is in the
top center. See Fig. 7-1.
Remove the pump.2.
Remove spark plug wire from spark plug and ground it to 3.
the engine before pulling the starter rope.
Rotate the engine by slowly pulling starter handle until 4.
engine coupling half set screw is visible. Loosen set screw
using allen wrench and slide coupling half off engine shaft.
Loosen the set screw on pump coupling half and remove 5.
coupling half.
Slide new engine coupling half onto the engine shaft until 6.
the end of the shaft is flush with the inner portion of the
coupling half. (There must be space between the end of
the engine support bracket and coupling half). Tighten set
screw.
Install pump coupling half and key on pump shaft. Rotate 7.
coupling half until set screw faces opening in shield. Do not
tighten set screw.
Install nylon “spider” onto engine coupling half.8.
Align pump coupling half with nylon “spider” by rotating 9.
engine using starter handle. Slide coupling half into place
while guiding three mounting bolts through holes in pump
support bracket.
Secure with nuts removed earlier.10.
Set .010” to .060” clearance/gap between the nylon “spider” 11.
and the engine coupling half by sliding a feeler gauge
or matchbook cover between the nylon “spider” and the
engine coupling half and moving pump coupling half as
needed. Secure pump coupling half with set screw. See Fig.
7-1.
NOTE: Make certain proper clearance/gap is obtained
before tightening set screw.
Reconnect the spark plug.12.
.0600
.0100
Hex Screw
Set Screw
Service
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