11-7
PUMP PISTON
Leakage of oil around the pump piston indicates worn or damaged piston packing.
To replace packing:
1. Remove piston actuating linkage.
2. Remove piston. (See piston drawing.)
3. Remove all packing. (See piston drawing.)
4. Clean all parts and dry with compressed air.
5. Install new packing, wipers and static seals, being sure, packing sealing lips, face down toward the
pressure. (Dip each part into clean hydraulic oil before assembly.)
6. Open the release valve (to allow air to bleed from piston barrel back to reservoir) and insert the
piston.
7. Replace piston linkage.
8. NOTE: With release valve open, stroke pump about a dozen times to bleed air completely from
pump.
329043
SECTION A-A
329044
329042
PUMP PISTON
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