Graco Viscount I 1000 Pump [11/16] Troubleshooting chart
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Graco Viscount I 1000 Pump [11/16] Troubleshooting chart

Graco Viscount I 1000 Pump [11/16] Troubleshooting chart
307622J 11
Troubleshooting Chart
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Relieve the pressure.
2. Check all possible causes and problems before
disassembling the pump.
PROBLEM CAUSE SOLUTION
Pump operates, but output low on both
strokes
Restricted lines or inadequate hydraulic
supply.
Clear lines; increase hydraulic supply.
Insufficient hydraulic pressure; closed or
clogged valves, etc.
Open; clean.
Exhausted fluid supply. Refill and reprime, or flush.*
Clogged fluid line, valves, etc. Clear.**
Piston check valve needs adjustment. Adjust. See page 10.
Packing nut too tight. Loosen.
Loose packing nut or worn packings. Tighten; replace.
Pump operates, but output low on down
stroke
Held open or worn intake valve. Clear; service. See manual 308117.
Pump operates, but output low on up
stroke
Held open or worn piston or packings. Clear; service. See manual 308117.
Erratic pump operation Exhausted fluid supply. Refill and reprime, or flush.*
Held open or worn intake valve or piston
packings.
Clear; service. See manual 308117.
Piston check valve needs adjustment. Adjust. See page 10.
Excessive hydraulic fluid supply volume. Lower.
Air entrained in fluid. Purge all air; change fluid.
Pump fails to operate Restricted lines or inadequate hydraulic
supply.
Clear; increase.
Insufficient 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 307654.
Dried fluid seizure of displacement rod. Service.*** See manual 308117.
* Stop the pump immediately if it is running too fast; check 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; disconnect fluid line. If pump starts when hydraulic power is restored, 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 dis-
placement rod seizure.

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