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Se rvice
7
17
NOTE: This Operator’s Manual covers several models. Features may vary
by model. Not all features in this manual are applicable to all models and
the model depicted may differ from yours.
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.
1. Disconnect the spark plug wire and ground it against the engine.
2. Remove the three flange lock nuts and hex screws that 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 Figure 7-1.
.090
.020
Flange Lock Nuts
Hex Screw
Set Screw
Figure 7-1
3. Remove the pump.
4. Loosen the set screw on the pump coupling half and remove the
coupling half.
5. Rotate the engine by slowly pulling the starter handle until 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.
6. Slide the new engine coupling half onto the engine shaft 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.
7. Install the nylon “spider” onto the engine coupling half.
8. Install the pump coupling half and key on the pump shaft. Rotate
the coupling half until the set screw faces down. Do not tighten
the set screw.
9. Align the pump coupling half with the nylon “spider” by rotating
the engine using the starter handle. Slide the coupling half into
place while guiding the three hex screws through the holes in the
pump support bracket.
10. Secure with the nuts removed in Step 2.
11. Set .020” to .090” of a clearance/gap between the nylon “spider”
and the engine coupling half by sliding a feeler gauge between
the nylon “spider” and the engine coupling half and moving the
pump coupling half as needed. Install the set screw and torque to
78 in-lbs to secure the pump coupling half. See Figure 7-1.
NOTE: Make certain the proper clearance/gap is obtained before
tightening the set screw.
12. Reconnect the spark plug.
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