Cummins ISX11.9 CM2250 – Service Manual Engine Will Not Crank or Cranks Slowly (Electric Starter)

Battery voltage is low

Check the batteries and the unswitched battery supply circuit. Refer to Procedure 013-009 in Section 13 and
Procedure 019-087 in Section 19.

Battery cables or connections are loose, broken, or corroded (excessive resistance)

Check the battery cables and connections. Refer to
Procedure 013-009 in Section 13
.

Engine-driven units are engaged

Disengage engine-driven units.

Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-013,
Procedure 007-037, and
Procedure 007-083 in Section 7. Refer to Cummins® Engine Oil and Oil Analysis Recommendations, Bulletin 3810340 and Procedure 018-003 in Section V in the Operation and Maintenance Manual, ISX11.9 CM2250, Bulletin 2883444. Use the oil type recommended in Section V of the operation and maintenance manual.

Battery capacity is below specification

Refer to
Procedure 018-021 in Section V
. Replace the batteries if necessary.

Batteries are cold

Check the battery heater. Refer to the OEM service manual.

Starting circuit component is malfunctioning

Check the the starting circuit components. Refer to the OEM service manual.

Starting motor pinion or ring gear is damaged

Remove the starting motor, and inspect the gear. Refer to Procedure 013-020 in Section 13,
Procedure 016-005 in Section 16, and the OEM service manual.

Crankshaft rotation is impaired

Check the crankshaft for ease of rotation. Refer to
Procedure 001-016 in Section 1
.

Hydraulic lock in a cylinder

Remove the injectors and rotate the crankshaft. Look for the source of fluid in the cylinder. Refer to Procedure 006-026 in Section 6 and
Procedure 001-016 in Section 1.

Internal engine damage

Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure 018-003 in Section V of the Operation and Maintenance Manual, ISX11.9 CM2250, Bulletin 2883444. Remove the oil pan and inspect for a damaged camshaft, push rods, pistons and liners. Refer to Procedure 007-025 in Section 7.