Graco Dyna-Star 236753, Instructions Manual

Page: 10 / 22

Troubleshooting
10 308390N
Troubleshooting
1. Follow Pressure Relief Procedure , page 8.
2. Check all possible problems and causes before dis-
assembling gun.
Problem Cause Solution
Pump will not run Closed dispense valve Pump only runs with valve open
Pressure too low Increase supply pressure using the
pressure adjusting valve
Insufficient hydraulic fluid supply Check hydraulic supply. Adjust to a
maximum of 3 gpm (11 lpm) flow
Clogged fluid outlet line, intake
valve, dispense valve, suction line. Relieve pressure. Check; clear
obstructions
Reciprocator damaged. Repair, See page 12 or 17.
Pump speeds up or runs erratically Pump piston and/or intake valve
worn Relieve pressure. Check and repair.
See page 17.
Empty supply container Refill and reprime. Do not allow
pump to run dry. Monitor closely or
use a low-level cutoff valve
Pump runs but output low on up
and/or down stroke Pump piston and/or intake valve
worn Relieve pressure. Check and repair.
See page 17.
Pump runs but output low on both
strokes Insufficient hydraulic fluid supply Check hydraulic supply
Pressure too low Increase supply pressure using the
pressure adjustment on the control
Clogged fluid outlet line, intake
valve, dispense valve, suction line Relieve pressure. Check; clear
obstruction
Excessive weepage from porous
plug (A) Worn throat seals Repair. See page 11
Hydraulic oil leaks from fittings in
the upper or lower reciprocator
blocks (53, 47) Fittings (16, 17, 25) are loose, or
their o-rings are worn or damaged Tighten the self-sealing fittings. If
leaking persists, change o-rings