Air Starter System Diagnosis ST400 Starter
Valve opens - Starter blow-by
Starter does not Engage
Check drive pinion for damage. Make sure that the correct drive pinion is
on the starter. Replace drive pinion if necessary. Check for damaged ywheel.
Check for blockage in internal housing port of starter. Remove blockage. Check
main supply hose for blockage or hose apper. Remove blockage or replace hose.
Check system air pressure. Use truck tire gauge on
Schrader valve located on starter control valve.
Should be 120 psi.
Cranks
Ok
Cranks
Ok
Cranks
Ok
Cranks
Ok
No, presssure is not 120 psi
Yes, presssure is 120 psi
Fill to 120 psi
Still Blow-by
Starter blow-by
A B
Still Blow-by
Malfunctioning Valve - Drain air from reservoir rst by removing 1/4” plug on starter
valve opposite tank ll. Loosen cap on Bottom of valve. Inspect plunger for damage
and/or proper lubrication. Lubricate or replace the plunger if necessary. Measure
resistance of solenoid coils. Resistance should be approximately 30 ohms. Replace
solenoid coils if necessary.
* Refer to Page 14-15 for valve maintenance.
Valve checked
Valve operates properlyRemove starter - inspect ring gear for damage.
Roll engine to inspect ring gear teeth. Check
starter pinion for damage.
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