Haskel AAD-5 - Check Valves; Troubleshooting Guide

Air Driven Air Amplifiers, AAD-5 & AAD-5-C • OM-11J
6
8. With screwdriver, gently remove both o-rings and rod bearings in pump section.
9. Inspect, replace and install all internal parts in air drive section and pump section per drawing
17711.
10. Relubricate air barrel with 50866 Haskel lubricant.
11. Reassemble pump in reverse order of disassembly instructions. Care must be taken in
disassembly and assembly that the flow and pilot tube o-rings be on the flow and pilot tubes prior
to assembly. Alternately (cross-wise) torque tie rods to a maximum torque of 16-18 foot pounds.
*NOTE: Eliminate steps 7 and 8 if no leakage through purge/vent port has occurred. Inspection and
replacement of o-ring and rod bearings should not be necessary.
Check Valves
Remove and inspect parts (Ref. dwg. 17711). Replace 28119 seats if damaged.
Troubleshooting Guide
Symptom Cause Remedy
1. Will not run at low air drive
pressures
(10 – 15 psi)
1. Excess friction of spool o-
rings 568017.
1. Necessitates relubrication or
replacement of spool o-
rings. (See instruction for
removing spool in Figure 2,
steps 1, 2, 3.)
2. Pump will not cycle, or slow
cycling.
1. Leakage of flow and/or pilot
tubes.
2. “Iced up” exhaust vent.
3. Indication that one or both
pilot valves are
malfunctioning.
4. Build-up of residue in
muffler.
1. Replace o-rings on flow pilot
tubes.
2. Remove ice.
3. Remove pilot valves, inspect
and repair per instructions in
maintenance section.
4. Remove muffler,
disassemble and clean.
3. “False” or double cycling or
continuous exhaust bleeding.
1. Small inlet air supply piping
magnifies any internal
leakage.
1. Increase air inlet piping and
replace o-rings in the
following order (test each
step):
a. No. 568015 o-ring
inside hex exhaust port
fitting.
b. Spool o-rings No.
568017.
c. Sleeve o-rings No.
568020. (See
instructions for removing
and replacing o-rings.)
4. Amplifier will not dead head
(stall)
1. Check valves contaminated
or damaged.
1. Remove, inspect, clean or
replace check valve parts as
necessary.
5. Excessive moisture or liquid
outside of muffler.
1. Air filter full of water. 1. Drain air filter.
6. Excessive leakage out vent
hole on top of pump section.
1. Piston rod seal leakage. 1. Replace rod seals. (Ref.
dwg. 17711.