Service

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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: On vertical shaft engines, it will be neccessary to remove the engine to access the hex screws securing the pump to the engine shaft. Taking the log splitter to an authorized service dealer is recommended.

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

Hex 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 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 mounting bolts through the holes in the pump support bracket.

10.Secure with the nuts removed earlier.

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.

.090

Set Screw

Flange Lock Nuts

.020

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.

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