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Troubleshooting Page 7‐31
Revised 4/12
ITW Dynatec c. 2012
DYNAMELT S ASU Manual #20‐59P
Problem
Possible Cause
Solution
Pump Motion on the
Forward Stroke (shaft
moving into pump) is
very slow or stopped.
1. Outlet check valve is
blocked closed.
1. Clean outlet check valve.
Pump Quick‐Strokes on 1. Outlet check valve is
the Reverse Stroke
blocked open.
(shaft moving out of
pump)
1. Clean outlet check valve.
Low or Inconsistent
Adhesive Output
1. Outlet filter is clogged.
1. Remove and inspect outlet filter.
Clean or replace as necessary. See
Chapter 6 “Preventive Maintenance"
for procedure.
2. Adhesive used is too
viscous.
2. Verify that system components are
at proper temperature and that
selected adhesive is correct for your
application.
3. Blocked hose.
Outlet
check
valve
4. Blocked applicator heads.
5. Pressure relief valve in
outlet block is opening.
Inlet
check
valve
Adhesive Leak at
Filter Drain
1. Filter drain valve not
tightly closed.
2. Filter drain valve blocked
open.
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 psi). If
relief valve is opening with air pres‐
sure less than 6.8 bar (100 psi),
adjust or replace pressure relief valve.
1. Close and tighten filter drain valve.
2. Remove filter plug assembly from
pump. Disassemble plug assembly,
clean and re‐install.