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17
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.
Disconnect the spark plug wire and ground it against the 1.
engine.
Remove the three flange lock nuts and hex screws that 2.
secure the pump to the coupling shield. Two flange lock
nuts and hex screws are at the bottom corners and one is in
the top center. See Fig. 7-1.
Remove the pump.3.
Loosen the set screw on the pump coupling half and 4.
remove the coupling half.
Rotate the engine by slowly pulling the starter handle until 5.
the engine coupling half set screw is at the bottom. Loosen
the set screw using an allen wrench and slide the coupling
half off the engine shaft.
Slide the new engine coupling half onto the engine shaft 6.
until 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 the coupling half).
Tighten the set screw.
Install the nylon “spider” onto the engine coupling half.7.
Install the pump coupling half and key on the pump shaft. 8.
Rotate the coupling half until the set screw faces down. Do
not tighten set screw.
Align the pump coupling half with the nylon “spider” by 9.
rotating the engine using the starter handle. Slide the
coupling half into place while guiding the three mounting
bolts through the holes in the pump support bracket.
Secure with the nuts removed earlier.10.
Set .0100” to .0600” of a clearance/gap between the nylon 11.
“spider” and the engine coupling half by sliding a feeler
gauge or matchbook cover between the nylon “spider” and
the engine coupling half and moving the pump coupling
half as needed. Secure the pump coupling half with the set
screw. See Fig. 7-1.
NOTE: Make certain the proper clearance/gap is obtained
before tightening the set screw.
Reconnect the spark plug.12.
.0600
.0100
Flange
Lock
Nuts
Hex Screw
Set Screw
Bottom View
Figure 7-1