Graco Viscount II 4500 Pump [11/16] Troubleshooting
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Graco Viscount II 4500 Pump [11/16] Troubleshooting

Graco Viscount II 4500 Pump [11/16] Troubleshooting
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Troubleshooting
WARNING
T
o reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
Before servicing this equipment, always make sure to
relieve the pressure.
NOTE:
Check all possible problems and solutions
before disassembling the pump.
Problem Cause Solution
Pump operates, but output low on
both strokes
Restricted lines or inadequate hy
-
draulic supply
Clear lines; increase hydraulic supply
.
Open flow control
both strokes
Insuf
ficient hydraulic pressure;
Closed or clogged valves, etc.
Open; clean.
Exhausted fluid supply
Refill & reprime, or flush*
Clogged fluid line, valves, etc.
Clear**
Packing nut too tight
Loosen
Loose packing nut or worn packings
T
ighten; replace. See manual
307–728
Pump operates, but output low on
down stroke
Held open or worn intake valve
Clear
, service. See manual 307–728
Pump operates, but output low on
up stroke
Held open or worn piston or packings
Clear; service. See manual 307–728
Erratic pump operation
Exhausted fluid supply
Refill and reprime, or flush*
Erratic pump operation
Held open or worn intake valve or
piston packings
Clear; service. See manual 307–728
Excessive hydraulic fluid supply vol
-
ume
Lower
Pump fails to operate
Restricted lines or inadequate hy
-
draulic supply
Clear; increase
Insuf
ficient hydraulic pressure; closed
or clogged valves, etc.
Open, clean
Exhausted fluid supply
Refill and reprime, or flush*
Clogged fluid line, valves, etc.
Clear**
Damaged hydraulic motor
Service. See manual 307–158
Dried fluid seizure of displacement
rod
Service***
* Stop the pump immediately if it is running too fast; check the fluid supply
. If empty
, refill and reprime the pump
being sure to eliminate all air from the system, or flush the pump and store it with an oil-based solvent, such as
mineral spirits, to prevent corrosion.
**
Relieve the pressure
, and then disconnect the fluid line. If the pump starts when the hydraulic power is re
-
stored, line, etc. is clogged.
*** Always stop the pump at the bottom of its stroke, and keep the packing nut/wet-cup 1/3 full of TSL to help
prevent displacement rod seizure.

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