LIMIT SWITCH REPLACEMENT
1.
Run actuator to zero percent.
2.
Remove actuator from pump only if necessary for access (see Actuator Removal).
3.
Mark the position of limit switch plate (284-A) on the frame of the unit; Reassembly in the same position is
critical. Remove limit switch plate.
4.
Loosen two screws (405-A) to detach each limit switch and lift off plate. Replace one switch at a time to ensure
proper wiring. Unsolder wires, noting proper location for subsequent assembly (see Figure 13). Resolder with
rosin solder and minimum heat. Do not allow solder or flux to flow into switch.
5.
Install new limit switch and replace plate assembly in original position. Replace actuator and run from zero to
100 percent to verify proper limit switch operation.
INDICATOR ADJUSTMENT
1.
Run actuator to 100 percent position; remove actuator cover (281-A).
2.
Loosen disc screw and rotate pointer to 100 percent.
3.
Tighten disc screw.
TRANSFER SHAFT/BUSHING REPLACEMENT
1.
Run actuator to zero percent.
2.
Remove actuator from pump only if necessary for access (see Actuator Removal).
3.
Remove drive belt (410-C) and transfer pulley (410-D) after loosening both transfer pulley setscrews.
4.
Loosen indicator pulley (410-A) setscrews. Tap out transfer shaft (268-A).
5.
To remove bushings, pry out the retaining rings and push out the bearings.
6.
Reassemble in reverse order. Set potentiometer resistance at less than 10 ohms before tightening indicator
pulley setscrews. Before replacing actuator, check resistance across terminals 4 and 5. Resistance should be
less than 10 ohms for a 250-ohm pot; less than 40 ohms for a 1000-ohm pot. When dual potentiometers are
used, the same resistance should be set across terminals 1 and 2. To set resistance, loosen indicator pulley
setscrews (410-D) and manually turn the potentiometer shaft. Tighten indicator pulley setscrews.
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