Page 7-12
Revised 1/05
ITW Dynatec c. 2004
DYNAMINI ASU Manual #20-25
Problem
Possible Cause
Pump Motion on the
1. Outlet check valve is
Forward Stroke (shaft
blocked closed.
moving into pump) is
very slow or stopped.
Pump Quick-Strokes on 1. Outlet check valve is
the Reverse Stroke
blocked open.
(shaft moving out of
pump)
Low or Inconsistent
1. Output filter clogged.
Adhesive Output
2. Adhesive used is too
viscous.
3. Blocked hose.
4. Blocked applicator heads.
5. Pressure relief valve in
output block is opening.
Adhesive Leak at
1. Filter drain valve not
Filter Drain Spout
tightly closed.
2. Filter drain valve blocked
open.
Solution
1. Clean outlet check valve.
1. Clean outlet check valve.
1. Remove and inspect output filter.
Clean or replace as necessary. See
Chapter 6 “Preventive Maintenance”
for procedure.
2. Verify that system components are
at proper temperature and that
selected adhesive is correct for your
application.
3. Inspect hose for kinks, internal plugs
of debris or char (degraded adhesive).
Clean or replace hoses as required.
4. Inspect heads for plugged nozzles,
proper air valve operation or plugged
filters. Clean or repair heads as
needed.
5. Verify that air supplied to pump is
less than 6.8 bar (100 PSIG). If
relief valve is opening with air pres-
sure less than 6.8 bar (100 PSIG),
remove pump and replace pressure
relief valve.
1. Close and tighten filter drain valve.
2. Remove filter plug assembly from
output manifold, clean and re-install.
Output
filter
Inlet check valve
Outlet
check valve
Loosen
set screw
Open
drain
Output
Manifold
