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Problem
Clutch drive is operating but there is
no flow
Erratic pump output
Grease Models
Lubricant is leaking from the reser-
voir
Restricted movement of follower
plate
Pump will not take a prime
Oil Models
Oil reservoir is filling very slowly
3A2781A
Cause
Reservoir is empty
Clutch is defective
Fluid temperature is below 12°F
(-11°C)
System was not bled properly
Pump seals, check valves or o-rings
are defective
Pump adjustment assembly is leak-
ing or sucking air during return stroke
Piston or bore is worn
Hex nuts (1) are not tight
Damaged or worn gasket (8)
Cracks or nicks in reservoir tube (11)
or reservoir is dented or out-of-round
Dented or out-of-round reservoir tube
(11)
Grease will not pull into pump
through quick disconnect
Fill screen (31) located in fill cap (30)
is clogged
Troubleshooting
Solution
Refill as required. See Filling The
Reservoir, page 9.
Remove clutch and operate pump
manually.
•
If there is output, replace clutch.
For this repair unit must be
returned to an authorized Graco
repair facility.
•
If there is no output, see Pump is
Not Running or Requires Servic-
ing section of this Troubleshoot-
ing Table.
Do not attempt to operate until tem-
perature problem is corrected.
Bleed manifold. See Manifold Bleed-
ing, page 11.
Replace defective parts using Pump
Drive Repair Kit.
Tighten output manifold block assem-
bly components.
Replace defective parts using Out-
put Manifold Kit.
Tighten hex nuts (1). Torque to 5 ft.
lbs (6.78 N•m).
Replace gasket (8).
Replace reservoir tube (11).
Replace reservoir tube (11).
Inject several ounces of heavy oil
through the grease fill quick discon-
nect. The pump will then prime on oil,
pulling the grease behind it. If it
becomes necessary to use this
method, all injected oil should be dis-
charged at the loosened system sup-
ply connection along with any air.
Clean or replace fill screen (31).
15
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