Nordson 2302 - 3. Pump Stroking Erratically or Too Fast

6-4
Troubleshooting
3. Pump stroking erratically
or too fast
Problem
Possible Reason
Corrective Action
Refer to
. Tank less than
No refill during normal operation
Refill tank to at least half full Section 4
half full
1. Adhesive not
melted
Tank temp setting incorrect
Tank temp channel not functioning
properly
Check tank temp setting and correct if
necessary
Later in
Go to TaMHose/Gun Fails to Heat or
this section
Underheats
I. Blocked tank
relief valve
Charred material from tank lodged in
tank relief valve
Clean or replace tank relief valve
Section 7
-. Char or foreign
See above
With pump assembly removed, clear
Section 7
material
char/foreign material from siphon ball
lodged at
seat ’
pump siphon
ball seat
(Note that
rapid
upstroke
indicates
upper ball
check valve
not seated;
rapid
downstroke
indicates
lower ball
check valve
not seated)
5. Pressure relief See above Clean or replace the relief valve
Section 7
valve seat
fouled
6. Pump
hydraulic
section
requires
attention
See above
Disassemble, clean and reassemble
pump hydraulic section
Section 7
PIN 106 701A
41-23OOSP- 1194
Q Nordson Corporation 1994
All Rights Reserved