TDI TURBO
TWIN
FROM
TECH DEVELOPMENT
Page 8
Publication T1-932
Issued May 20, 2016
6.0 OPERATOR’S TROUBLESHOOTING GUIDE
TROUBLE PROBABLE
CAUSE
SOLUTION
1. Air always flow through
exhaust
A. Relay valve improperly
installed.
A. Check typical installation
diagram and correct.
B. Relay valve not sealing
properly.
B. Check for damaged sealing
ring, replace relay valve or
damaged parts.
C. Solenoid is not sealing,
pressure remains in APP port of
relay valve.
C. Check solenoid potential at the
lead to ground should be 0. If not,
fix ignition switch problem.
2. Starter engages but does not
run,
A. Bad relay valve
A. Replace relay valve.
3. Starter does not run, small air
flow from turbine exhaust or
drive housing.
A. Nozzle blockage.
A. Remove blockage or obstruction
from nozzles.
4. Starter does not run. Normal
air flow from exhaust.
A. Excessive bends in the
supply line.
A. Shorten length or straighten
supply air line.
5. Pinion does not engage
A. Air pressure is too low
A. Increase air pressure to 40 -
150 psig.
B. Control lines to starter ports
reversed.
B. Check installation diagram and
correct.
C. Solenoid valve not operating
or plugged.
C. Check wiring and solenoid
operation. Correct wiring, remove
blockage, or replace solenoid
valve as needed.
D. Damaged pinion teeth.
D. Replace pinion or starter drive
as necessary.
6. Starter runs but engine cranks
slowly or not at all.
A. Air pressure too low
A. Increase air pressure to 40 –
150 psig.
B. Excessive back pressure.
B. Check Exhaust Closure Plate.
C. Nozzle blocked or damaged.
C. Remove blockage or replace
damaged parts.
7. Starter continues to operate
after start button is released.
A. Solenoid valve is not sealing
correctly.
A. See 1C above
B. Relay valve is not sealing
correctly.
B. See 1B above
8. Air tank pressure decays after
extended shut down.
A. Air connections are not tight.
A. Tighten loose fittings. Repair or
replace damaged fittings.
B. Damaged air lines: crushed,
frayed, and kinked.
B. Replace damaged lines.
C. Relay valve is not sealing
correctly.
C. See 1B above
D. Solenoid valve is stuck open.
D. A. See 1C above
