Pump Troubleshooting - Graco XP35 Instructions Manual

Problem
Fluid outlet pressure gauges split
only at the top changeover (if one
gauge drops the other will rise).

Pump Troubleshooting

This chart uses proportioning fluid gauges to determine pump malfunctions. Observe the gauge readings during the
stroke direction indicated by the bold arrow, and immediately after closing the gun or mix manifold. Refer to other
manuals to troubleshoot individual components.
TROUBLE AREA:
Resin Pump Leakage
1. Throat packing
2. Piston packing
3. Piston ball check
Resin
Pump
TROUBLE AREA:
Resin Pump Leakage
1. Throat packing
2. Intake ball check
Resin
Pump
Falling
3A0420V
Not fully loading one side on
upstroke.
Air mixed in fluid from excessive agi-
tation or circulation.
Falling
r_258914_3a0420a_11a
Hardener
Pump
Rising
r_258914_3a0420a_10a
Cause
TROUBLE AREA:
Hardener Pump Leakage
1. Throat packing
2. Piston packing
3. Piston ball check
Hardener
Pump
Rising
TROUBLE AREA:
Hardener Pump Leakage
1. Throat packing
2. Intake ball check
Solution
Increase feed pressure on side that
dropped.
Increase feed hose size.
Clean inlet strainer or hopper screen.
Flush and add new fluid.
Resin
Pump
Rising
r_258914_3a0420a_11a
Resin
Pump
Rising
r_258914_3a0420a_10a
Troubleshooting
Hardener
Pump
Falling
Hardener
Pump
Falling
37