9
L-1600 (04/01/21)
MAINTENANCE
DIAPHRAGM REPLACEMENT
Change diaphragms every 500 hours or three months,
whichever comes first.
1. Drain oil from crankcase as instructed previously.
2. Remove pump head bolts and heads.
3. Remove the bolt securing the diaphragm (See Figure 4).
4. Remove the old diaphragm and the washer (See Figure 4).
5. Install a new diaphragm. Then turn the crankshaft to bring
the piston to its mid-stroke and seat the diaphragm into the
sleeve groove.
6. Install the washer and bolts removed in steps 3 and 4.
7. Replace the pulsation dampener diaphragm by first
bleeding the air from the dampener. Remove the bolts
from the dampener cover and replace the diaphragm.
Reassemble the cover in place and charge the dampener to
20% of the operating pressure.
8. Refill the crankcase with Hypro oil (part number 2160-
0038).Rotate the shaft to distribute the oil, and fill to proper
level.
FIGURE 4
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