Troubleshooting Guide - Haskel 4B Serie Manuel De Fonctionnement Et D'entretien

Troubleshooting Guide

Air Drive Side
Problem
A. Will not cycle.
No audible air leakage at air
exhaust port.
B. Will not cycle.
Audible air leakage at air
exhaust port.
C. Will not cycle (or short
cycle). Audible air leakage at
pilot vent hold lower cap
casting.
D. False cycling (rapid
"hunting" action). Air
continuously leaks at vent
port in upper air cap. Or
rapid "puffing" of pilot air out
vent hole in hydraulic cap.
Liquid Side
Problem
E. Liquid blowing out muffler.
F. Will not stall against blocked
system or will not prime.
G. Excessive pulsation or
output pressure.
H. Output flow diminishing with
constant conditions.
Air Driven Liquid Pump 4B Series • OM-16F
Possible Cause(s)
1. Cycling spool stuck due to
contamination.
2. Low drive pressure
3. Pilot valve stem(s) too short
or reversed.
1. Drive air volume being
restricted.
2. Drive air o-ring P/N 56225
damaged or undersize (due
to age).
3. Spool o-rings P/N 546285
worn or damaged.
1. Seat of pilot valve 27375-3
damaged or spring 57324
broken.
2. Pilot valve springs reversed.
1. Pilot air loss past dynamic o-
ring 568115-2 on spool.
2. Pilot valve 27375-5 seat
damaged or 16513 broken.
Possible Cause(s)
1. Damaged or worn plunger
seal.
1. Inlet check valve damaged.
1. Outlet check valve
damaged.
1. Inlet check valve leakage.
8
Action
1. Remove spool from upper
cap (per instructions 4.1 A
thru D). Clean, inspect,
relube and reinstall. Check
drive air filter.
2. Provide 25 psi minimum.
3. Replace or assure that
27375-5 and 27375-3 are in
proper location per
assembly drawing.
1. Increase air line size.
2. Replace (per instructions 4.2
A thru G).
3. Replace (per instructions 4.1
A thru D).
1. Replace (per instructions 4.3
A, B).
2. Install correctly per
assembly drawing. 57324 is
lighter.
1. Replace o-ring (4.1 A thru
D)
2. Replace. (4.3 A, B)
Action
1. Replace seal. (4.4)
1. Inspect, repair or remove
contamination. See also 3.1
D.
1. Inspect, repair or remove
contamination. See 4.4 B
and also 3.1 D.
1. Inspect inlet check for
damage or contamination.
Clean & repair. (4.5 A thru
D).