4-81. HIGH PRESSURE PUMP ASSEMBLY. This task covers:
Tools, see Appx B, Sec III, Ref Code (No.):
General Safety Instructions:
Tool Kit, General Mechanics Automotive (1)
Gage, Belt Tension (13)
Observe specific Warning in text.
Bucket, Five Gallon
Do not wear jewelry or loose clothing while
working on unit.
Lubricating Oil (Appx E, Sec II, Item 52)
Equipment Condition: ROWPU shutdown. High pressure
pump circuit breaker CB6 (63, Figure 2-4) turned OFF.
High pressure pump belt guard removed (para, 4-82).
Make sure electrical power is disconnected before working on unit. Failure to do so could
result in serious injury from electrical shock or moving parts.
Oil level should be at middle of sight gage.
Check oil level by means of sight gage (3, Figure 4-95).
If oil level is low, remove fill plug (2) and add oil as required to bring oil level to the middle of sight gage (3).
Oil must be replaced at the intervals specified in the PMCS. Proceed as follows :
Place a container large enough to hold 3 gallons (11.4 liters) of oil beneath oil drain plug (1). Obtain a funnel.
Remove oil drain plug (1), fill plug (2) and use the funnel to drain the crankcase oil into the container.
Observe the appearance of the oil drained from the crankcase. If it has a "milky" appearance, this indicates that water is
leaking past plunger rod seals into the pump. Notify direct support maintenance if this condition is noted.
Check magnetic drain plug (1) for metal particles. If large quantities of metal particles are observed, notify direct support
maintenance. This is an indication of abnormal wear in moving pump parts.
Figure 4-95. Service High Pressure Pump