Graco HIGH-FLO 220-569 - Manual (Page 17)

307-809 17
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 12.
1. Relieve the pressure.
2. Check all possible problems and solutions before
disassembling pump.
PROBLEM CAUSE SOLUTION
Pump output low on both strokes. Restricted air or hydraulic supply
lines.
Clear any obstructions; be sure all shut-
off valves are open; increase pressure,
but do not exceed maximum working
pressure.
Exhausted fluid supply. Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Worn piston packing (15).
Replace. See page 20.
Pump output low on only one
stroke.
Held open or worn check valve. Check and repair.
Worn piston packing (15). Replace. See page 20.
Pump operates erratically. Exhausted fluid supply. Refill and reprime pump.
Held open or worn check valves. Check and repair.
Worn piston packing (15). Replace. See page 20.
Excessive hydraulic fluid supply pres-
sure to Viscount motor.
See Viscount motor manual.
Pump will not operate. Restricted air or hydraulic supply
lines.
Clear any obstructions; be sure all shut-
off valves are open; increase pressure,
but do not exceed maximum working
pressure.
Exhausted fluid supply. Refill and reprime pump.
Clogged fluid outlet line, valves, etc. Clear.
Damaged air motor or hydraulic mo-
tor.
See motor manual.
Fluid dried on piston rod (17). Disassemble and clean pump (see
page 20). In future, stop pump at bottom
of stroke.
Pump will not prime. Suction line clogged. Clear. Flush more frequently.
Held open or worn check valves. Check and repair.
Piston assembled with wrong nut. Use only the large, round, special nut
(12).
Excessive throat leakage. Worn piston rod (17) or throat pack-
ings.
Replace. See page 20.