Pulsafeeder Pulsa Series Pulsamatic Controls - Manual (Page 17)

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6.5 Jammed Slider Block
1. The slider block is probably jammed if the stroke cannot be freely adjusted using the handwheel
with the override switch pulled out and no pressure load on the pump. To confirm the problem,
remove the cover (Item #529A, Figures 8 and 9) over the oscillating housing and observe the
position of the front connecting rod, Item #353, where it enters the housing, Item #351 where
Figure 5 refers. If the slider block is jammed, the connecting rod will be at the extreme top or
bottom position.
2. Two free a jam, turn the slotted nut, Item #535, with the cotter pin, Item #539, remaining in
place, using a wrench. (Refer to Figures 8 and 9). If the connecting rod is in the top position,
rotate the nut counterclockwise. If the connecting rod is in the bottom position, rotate the nut
clockwise.
3. Replace the cover.
7. Ordering Parts
When ordering replacement parts, always specify:
1. Pump model and serial number (stamped on the pump nameplate, e.g. 7120-S-AE with
S/N 8604146-1)
2. The part name and part number from the parts lists.
8. Conversion (Manual to PULSAmatic)
Follow these instructions when converting from manual to PULSAmatic stroke adjustment.
Numbers in parentheses refer to items as appropriate in Figures 5 through 9, except as noted.
Removal of the Existing Manual Control Assembly
1. Disconnect the power supply going to the pump drive motor. Remove the motor coupling guard.
2. Drain out the pump oil into a clean container if it is to be reused or into a suitable container for
disposal.
3. Remove the cover screws (530). Pull the cover back toward the motor and lift it off.
4. Inspect the gearbox internal components for broken, missing or worn parts at this time it is
advisable to flush any sediment or foreign material from the gearbox, using a suitable solvent.
5. Remove the rear connecting rod cotter pin (#545) and wrist pin (#544).
6. Remove the housing pivot pins (#547).
Models 7120 and 7440
Remove the retainer set screws (#546) located directly above the housing pins in the opt surface
of the gearbox.
NOTE: If slight heat is applied to the pivot pins to loosen paint, or sealant, ensure that no
cleaning or combustible fumes or materials are present.