Lesson 3/Learning Event 1
Inspect and replace parts showing excessive wear.
When replacing the check valve assembly, make sure that the large weight
(6) is on the pump side of the gasket and that the hinge end of the gasket is
Impeller and/or Seal. To repair or service the impeller or seal, refer to figure 7 on page 30.
Remove the shoulder bolts (32) and cover plate (27). Remove the capscrew (25),
lockwasher (24). flatwasher (23). and impeller (22), exposing the wear plate (21).
Remove the shims (20) and adapter shaft (19), exposing the seal assembly (18). Loosen
the peeler setscrew (17) and remove the diverter (14) through the discharge opening.
Inspect all parts for excessive wear or damage, and replace any unserviceable parts.
Reassemble the shaft/impeller assembly using sufficient shims (20) to result in an
impeller-face to wear plate-face clearance of 0.010 to 0.015 inch. Reassemble the peeler
and adjust to result in peeler-to-impeller clearance of 0.005 to 0.015 inch.
Lightly oil the O-ring (26). Reassemble the cover plate (27) in place on the pump body
Fuel Tank, Bracket, and Fuel Valve
In servicing the 50-GPM Pump, you may have to remove the fuel tank and fuel valve. The
procedures for removal of the fuel tank, bracket and fuel valve from the Model 1A08-1 engine
differ from the procedures for removal of these components from the Model 1A08-3 engine.
Model l A08-1 Engine. To remove the components from the Model 1A08-1 engine, refer to
figure 8 on page 32.
Drain the fuel tank and disconnect the fuel line.
Remove the fuel valve and nipple.
Remove the fuel tank, bracket, tank cap, strainer, and gasket.