Rev. 5.7.2019
TCD MANUAL
Copyright 2019 Vestil Manufacturing Co.
Page 18 of 20
Troubleshooting
DO NOT attempt to resolve any issue discussed below UNTIL the chute is fully lowered and the
power supply is disconnected.
Contact
Technical Service
to discuss any issue that is not addressed in this guide or if you need assistance
implementing a solution described in this guide.
Issue:
Possible cause(s):
Solution:
1. Power unit doesn’t run when UP
button is pressed.
1a.Transformer fuse is blown.
b. No supply voltage.
c. Upper-travel limit switch is
engaged or bad.
d. Faulty connection in control
circuit.
e. Bad control transformer.
f. Open motor relay coil.
g. (DC units) Low battery voltage.
1a. Test with meter; replace if bad.
b. Test with meter. Check fuses,
breakers, and overloads to determine
the cause.
c. Inspect and test switch. Replace if
bad.
d. Test all parts of circuit with meter.
e. Check for 24 VAC; replace if bad.
f. Test with meter; replace if bad.
g. Test with meter. Charge battery if
low (is motor relay LED on?)
2. Motor runs properly, but chute
doesn’t move. Motor and pump are
quiet.
2a. Incorrect motor rotation.
b. Pump failure.
c. Low hydraulic fluid level.
2a. Verify motor shaft rotates
counterclockwise.
b. Consult factory for replacement.
c. Ensure reservoir is filled.
3. Motor hums, chatters, or buzzes, or
some type of squeal can be heard,
but the chute either does not move
or only moves very slowly.
3a. See 2b above.
b. Excess voltage drop to motor
due to power wire size too small,
wire run too long, or incoming
voltage too low.
c. (3-phase motors) Motor is
“single-phasing”.
d. Pressure relief opening at full
pressure.
e. Contamination holding open
the lowering valve or the check
valve.
3a. Same as 2b.
b. Check power installation for
adequacy. Check incoming voltage
while motor is running
. Correct
problem(s).
c. Determine cause of loss of voltage
on one phase; correct.
d. Check for structural damage or
binding of the rollers, etc.
Check for chute overload condition.
e. Remove and inspect. Clean the
valve with mineral spirits.
4. Chute elevates, then drifts down.
4. See 3e above.
4. Same as 3e.
5. Chute lowers too slowly.
5a. Flow control spool is stuck.
b. Pinched hose.
c. Velocity fuse locking (chute
only slowly creeps down).
5a. Remove plug from FC port; push
down on the center of the flow spool to
ensure it moves freely.
b. Check pressure, supply, and return
hoses for kinks.
c. Same as 7 (below).
6. Chute lowers too quickly.
6a. See 3e.
b. Flow control spool is stuck.
6a. Same as 3e.
b. Same as 5a.
7. Spongy or jerky chute motion.
7. Air in the hydraulic cylinders.
7. Bleed air per procedure described
on p. 10 of this manual.
