Troubleshooting - Graco 262927 Instructions Manual

Troubleshooting

Troubleshooting Troubleshooting
To prevent skin injection and splashing, never
open a camlock hose or applicator fitting
while there is pressure in the fluid line. See
Pressure Relief Procedure, page
1. Perform Pressure Relief Procedure. See
Pressure Relief Procedure, page
2. Check all possible problems, causes, and
solutions listed below before disassembling
pump.
PROBLEM PROBLEM — — — CAUSE PROBLEM CAUSE — — — SOLUTION CAUSE
Example:
• Problem. Problem. Problem.
Cause.
–
♦ Solution.
Does not not operate. operate.
• Does Does not operate.
Air motor pilot valve (211) is faulty.
–
♦ Remove valve by disconnecting swivel unions.
Connect hose directly to air motor. Operate
motor directly with air regulator (210).
– Valve closed or clogged.
♦ Clear air line; increase air supply. Check that
valves are open.
– Fluid hose or applicator obstructed.
♦ Clean hose or applicator.*
Dried fluid on displacement rod or inlet ball.
–
♦ Clean rod; always stop pump at bottom of
stroke; keep wet-cup filled with compatible
solvent. Be sure inlet ball moves freely.
Air motor parts dirty, worn or damaged.
–
♦ Clean or repair air motor. See motor manual.
Output low low on on both both strokes. strokes.
• Output Output low on both strokes.
Air line restricted or air supply inadequate.
–
Valves closed or clogged.
♦ Clear air line; increase air supply. Check that
valves are open.
– Fluid hose/applicator obstructed; hose ID too
small.
♦ Clear hose or applicator*; use hose with larger
ID.
332612C
15.
15.
SOLUTION SOLUTION
Output low low on on down-stroke. down-stroke.
• Output Output low on down-stroke.
Open or worn intake valve.
–
♦ Clear or service intake valve.
Output low low on on up-stroke. up-stroke.
• Output Output low on up-stroke.
– Open or worn piston valve or packings.
♦ Clear piston valve; replace packings.
Erratic accelerated accelerated speed. speed.
• Erratic Erratic accelerated speed.
– Fluid supply exhausted, clogged suction.
♦ Refill hopper and prime pump.
Open or worn piston valve or packings.
–
♦ Clear piston valve; replace packings.
Open or worn intake valve.
–
♦ Clear or service intake valve.
• Cycles Cycles Cycles or or or fails fails to to to hold fails hold pressure hold
Worn check balls, seats, or piston packing.
–
♦ Service lower. See
the Pump (Daily), page
Poor finish finish or or or irregular irregular spray
• Poor Poor finish irregular
– Incorrect fluid pressure at applicator.
♦ See applicator manual; read fluid
manufacturer's recommendations.
– Inadequate air assist air pressure.
♦ Adjust air assist needle valve.
– Dirty, worn, or damaged spray applicator.
♦ Service spray applicator. See spray applicator
manual.
• Cannot Cannot Cannot open open or or or close open close close air
applicator.
applicator. applicator.
Dirty air clogged the air motor pilot valve.
–
♦ If no ball valve is immediately available:
Bypass the air motor pilot valve so air is
always supplied to air motor, regardless of
applicator pilot valve position. Then control
fluid flow by adjusting air regulator pressure
up and down as needed. Install new pilot ball
valve when one becomes available.
Troubleshooting
pressure at at at stall. pressure stall. stall.
Disassemble and Clean
30.
spray pattern. pattern.
spray pattern.
air air motor motor motor pilot pilot ball pilot ball valve ball valve on valve on on
35