Grizzly T21888 - Manual (Page 18)

model t21888 (mfg. since 2/10) - 16
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symptom possible cause possible solution
Air leaks from pressure
switch. 1. Faulty check valve.
2. Faulty pressure switch.
1. repair the check valve
( page 18).
2. replace pressure switch.
low pressure at the
tank, or tank pressure
drops after compressor
is turned
OFF.
1. Air leaks in tanks or deliv-
ery pipes.
2. drain valve open.
3. Air filter clogged.
4. pressure switch turns the
motor OFF too soon.
5. leaking check valve.
6. pressure relief valve
releasing below 110 psi.
7. gaskets leaking.
8. Worn rings.
1. Check air tank, pipes and
all connections for leaks.
2. Close drain valve.
3. inspect and clean air fil-
ter.
4. Adjust the pressure
switch ( page 20).
5. repair the check valve
( page 18).
6. replace pressure relief
valve.
7. Check gaskets on cylin-
der head assembly, repair
or replace as needed.
8. inspect and replace pump
piston rings.
pressure relief valve
stays open and motor
won’t stop running. 1. pressure switch adjusted
too high.
2. Faulty pressure switch,
unit is trying to overpres-
sure the tank.
3. Faulty pressure relief
valve.
1. Adjust the pressure
switch ( page 20)
2. turn compressor oFF,
unplug from power sup-
ply, and empty tank.
do not UsE until switch
is replaced.
3. relief valve is reliev-
ing pressure too early.
replace pressure relief
valve.
Air tool has low supply
pressure but compres-
sor has sufficient air
pressure. 1. in-line filter is damaged
or clogged (if used).
2. in-line water separator is
full (if used).
3. pressure regulator.
4. Air leaks in hoses.
5. pressure gauge bad.
6. pressure switch turns the
motor OFF too soon.
1. replace filter or in-line
filter assembly.
2. drain water separator.
3. Adjust pressure regula-
tor, if no improvement,
inspect regulator for leaks
or replace.
4. Check air hoses and all
connections for leaks .
5. replace the pressure
gauge.
6. Adjust the pressure
switch ( page 20).