2. If either brake drags without being energized and the gap is less than 10 mils, equally
shim all three spacer sleeves, Items #608, to increase the air gap to the specified
range. Refer to Figures 6 and 7. Item 607 denotes shim location on the illustrations, but
as a spare part. It consists of a pack of six 20-mil shims and twelve 5-mil shims.
NOTE: Care must be taken in this adjustment as permanent damage can result. We
recommend that all other possible causes listed under “Troubleshooting-Brake
Slipping” be investigated first.
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.
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