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Troubleshooting
To help avoid serious injury from splashing fluid, never
open a camlock hose or applicator fitting while there is
pressure in the fluid line. See Pressure Relief Proce-
dure, page 12.
Problem
Does not operate
Output low on both strokes
Output low on down-stroke
Output low on up-stroke
Erratic accelerated speed
Cycles or fails to hold pressure at
stall
Poor finish or irregular spray pattern
3A5275B
1. Follow Pressure Relief Procedure, page 12.
2. Check all possible problems, causes, and solutions
Cause
Air motor pilot valve (211) is faulty
Valve closed or clogged
Fluid hose or applicator obstructed
Dried fluid on displacement rod or
inlet ball
Air motor parts dirty, worn, or dam-
aged
Airline restricted or air supply inade-
quate; valves closed or clogged.
Fluid hose/applicator obstructed;
hose internal diameter too small
Open or worn intake valve
Open or worn piston valve or pack-
ings
Fluid supply exhausted, clogged suc-
tion
Open or worn piston valve or pack-
ings
Open or worn intake valve
Worn check balls, seats, or piston
packing
Incorrect fluid pressure at applicator
Inadequate air assist air pressure
Dirty, worn, or damaged spray appli-
cator.
listed below before disassembling pump.
Remove valve by disconnecting
swivel unions. Connect hose directly
to air motor. Operate motor directly
with air regulator (210).
Clear air line; increase air supply.
Check that valves are open.
Clean hose or applicator.◆
Clean rod; always stop pump at bot-
tom of stroke. Keep wet-cup filled
with throat seal liquid (74). Be sure
inlet ball moves freely.
Clean or repair air motor. See motor
manual.
Clear air line; increase air supply.
Check that valves are open.
Clear hose or applicator.◆ Use hose
with larger internal diameter.
Clear or service intake valve.
Clear piston valve; replace packings.
Refill hopper and prime pump.
Clear piston valve; replace packings.
Clear or service intake valve.
Service lower. See Disassemble
and Clean the Pump (Daily), page
22.
See applicator manual; read fluid
manufacturer's recommendations.
Adjust air assist needle valve.
Service spray applicator.◆ See spray
applicator manual.
Troubleshooting
Solution
27
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