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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 before you check or service
any system equipment.
2. Check all possible causes and solutions in the
Troubleshooting Chart before disassembling the
pump.
Problem
Pump fails to operate
Continuous air exhaust
Erratic pump operation
Pump operates, but output low on
up stroke
Pump operates, but output low on
down stroke
Pump operates, but output low on
both strokes
* Follow the Pressure Relief Procedure, and disconnect the fluid line. If the pump starts when the air is turned on
again, the line, etc., is clogged.
Troubleshooting
Note: To troubleshoot or service the following system
Cause
Inadequate air supply pressure or
restricted air lines
Closed or clogged valves
Clogged fluid lines, hoses,
valves, etc.
Damaged air motor
Exhausted fluid supply
Worn or damaged air motor gasket,
packing, seal etc.
Exhausted fluid supply
Held open or worn intake valve or
piston packings
Held open or worn piston packings
Held open or worn intake valve
Inadequate air supply or restricted air
lines.
Closed or clogged valves
Exhausted fluid supply
Clogged fluid lines, hoses,
valves, etc.
Packing nut too tight
Loose packing nut or worn packings
components, refer to the instruction manuals
listed below.
Component
Spray Gun 208–237
Air Regulator 202–156
Ball Valve 208–393
Ball Valve 210–657
Swivel 204–940
Solution
Increase air supply; clear*
Open; clean
Clear*
Service air motor
Refill and reprime, or flush
Service air motor
Refill and reprime, or flush
Clear; Service
Clear; service
Clear; service
Increase air supply; clear*
Open; clean
Refill and reprime, or flush
Clear*
Loosen
Tighten; replace
Manual
307–046
307–204
307–069
306–861
308–861
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Troubleshooting
