The Cummins/Onan HDKAS is a 0.9 L 3-cylinder liquid-cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the HDKA. It holds 4.5 L (1.2 gal) of oil and 4.73 L (1.2 gal) of coolant.
Also known as: Cummins HDKAS
| Oil capacity | 4.5 L |
|---|---|
| Coolant capacity | 4.73 L |
| Displacement | 0.898 L |
| Cylinders | 3 |
| Aspiration | Liquid-cooled |
| Rated speed | 1800 rpm |
| Symptom | Cause | Remedy |
|---|---|---|
| NO AC OUTPUT VOLTAGE AT RATED ENGINE RPM | Load circuit breakers closed, overload in the load circuit, open circuit between brush block and voltage regulator, brushes stuck or not making good contact with slip rings, opens or grounds in rotor or stator, incorrect field voltage, wrong connections of F1 and F2 leads | Locate cause of overload and correct as required. Reset breaker, or replace if bad. Check continuity of circuit breakers and replace if necessary. Is circuit open between brush block and voltage regulator? Check for continuity and correct if circuit is open. Are brushes stuck in holder or not making good contact with slip rings? Release brushes if jammed in holder. Clean slip rings if dirty. Test continuity of rotor, stator per Tests [B], [C]. Are there opens or grounds? Replace component if defective. Test field voltage per TEST [A]. Is there correct field voltage? Examine brush block connections. Are F1 and F2 leads installed on correct terminals? Perform TEST [D]. Connect brush leads to correct terminals. |
| UNSTABLE OUTPUT VOLTAGE, ENGINE SPEED STABLE | Broken wires or loose connections on voltage regulator assembly, brushes not OK | Are there any broken wires or loose connections on voltage regulator assembly? Check wiring harness from regulator assembly to end bell per TEST [F]. Check OK? Repair as required. Inspect brushes per procedure in Manual Section 4. Brushes OK? Repair wiring or replace as required. |
| Engine does not crank. | Is battery dead? Check CB11 circuit breaker. If okay, jumper battery cable B+ connection to B1 starter so- lenoid terminal. Does engine crank? With S11 in Start position, is battery voltage present between K11 terminal S and ground? If K11 does not energize, test per Checkout [D] and replace if bad. Is battery voltage present at B1 solenoid terminal with S11 in Start position? Check battery per Checkout [A] and recharge or replace. Check battery charger operation per Checkout [C]. Check battery cables for clean tight connections (ref. Checkout [B]). Check B1 starter so- lidoid and motor: if bad, repair or replace. Check B+ wiring to S11, and between S11 and K11. Check NC contacts of A11-K15. Replace if bad. | |
| Unbalanced generator set output voltage | Remove load at generator set terminals. Are generator set leads connected and grounded properly? See Test [C]. Is generator set stator winding continuous per TEST [C]? Check load for ground faults and correct as necessary. Check for correct grounding of generator set and load. Correct as necessary. Replace stator assembly. |
Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.
Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan HDKAS.
The Cummins/Onan HDKAS engine has an oil capacity of 4.5 liters.
The Cummins/Onan HDKAS has a displacement of 0.898 liters with 3 cylinders.
The Cummins/Onan HDKAS powers 1 generator set(s), including Cummins/Onan HDKA.
A commonly reported issue on generators using the Cummins/Onan HDKAS is: Weakness and Sleepiness. Fix: IF YOU OR ANYONE ELSE EXPERIENCE ANY OF THESE SYMPTOMS, GET OUT INTO THE FRESH AIR IMMEDIATELY. If symptoms persist, seek medical attention. Shut down the unit and do not operate until it has been inspected and repaired..