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Troubleshooting
311327E 9
and an off-ratio condition will result. This
malfunction will appear almost identical to
cavitation, but somewhat less severe.
4. Pilot Valves - Check each valve for proper
operation. If either valve is defective or damaged,
replace both valves.
5. Damaged Piston Packing - Check piston packing
set for mars or scoring. Replace piston packing set if
damaged.
6. Air Motor Assembly - Check air motor cylinder and
lubricate if necessary. Also, check o-rings and seals
for wear and/or damage. Replace if necessary.
Hose Heat System
Problems
To avoid unnecessary repairs, try the recommended
solutions in the order given for each problem. Before
assuming there is a problem, determine that all circuit
breakers, switches, and controls are properly set.
Solutions
1. Hose Length - The hose heat system of the
Predator is designed to maintain the chemical
temperature developed by the primary heaters with
up to 310 feet of hose. (Hose lengths greater than
this require the use of an auxiliary hose heat
system. Call Graco-Gusmer for details). In addition,
if ambient temperature is too cold, the hose circuit
may not have enough power to maintain the
chemical temperature.
2. Hose Heater Power Control - Ensure that the
power control is adjusted until the ammeter reads
15 amps (do not exceed 15 amps).
3. Hose Heat Fuse - With the main power OFF and
locked out at the source, remove the fuse and check
it for continuity or simply replace it with a new one.
4. Hose Heating Element - With the hose heat circuit
breaker OFF, check to see that the Power-Lock
connectors on the hoses and all electrical
connections between the hoses and unit are tight. If
these connections are secure and hose heat is not
present, perform a systematic search for the
electrical fault. To search for the electrical fault,
proceed as follows:
a. With the hose heat circuit breaker OFF and the
power control turned fully counterclockwise,
starting at the gun whip, unplug the Power-Lock
connectors and plug the hose troubleshooting
jumper plug (included with accessory package)
into the last “upstream” segment of hose.
b. Turn ON the hose heat circuit breaker and turn
the hose heater power control (clockwise) until
the ammeter reads 15 amps. If hose heat is
restored, then the fault is within the gun whip.
If hose heat is not restored, turn the hose heater
power control fully counterclockwise, then turn
OFF the hose heat circuit breaker and the main
power disconnect and proceed with the steps
below:
Problem Solution
Hose warm but does not reach temperature
or takes too long to reach temperature.
1,2,5,6,7
Hose does not heat; Light on. 2,3,4,7
Hose Heat Circuit Breaker trips or fuse
blows.
2
Hose temperature not maintained during
flow.
1,2,5,6,7
Hose or hoses adjacent to the unit are warm
- hoses downstream are cold.
4
Replace the fuse with one of the same rating. A substi-
tute may damage the equipment and would create a
potential source of injury to the operator.