MAINTENANCE

Changing Oil

Preserve the environment! Drained gear oil is classified as a hazardous toxic material which must be recovered, handled, stored and disposed of according to applicable State or Federal guidelines.

Change Interval

Change the oil at intervals specified in the Maintenance and Lubrication Manual (TS494).

Draining Oil

Before draining oil from the transmission, the oil should be at normal operating temperature.

Remove the magnetic drain plug (Figure 58) from the bottom of the transmission main case and drain the hot oil into an industry-approved recovery container.

Clean and replace the magnetic drain plug, then torque plug to 34–41 N•m (25–30 lb-ft).

Oil Fill

Remove the oil filler plug (2) (Figure 59), then fill the transmission using specified oil until the oil is level with the bottom of the filler plug hole (also see Figure 56). Do NOT overfill.

MACK-approved lubricants can be found on the internet at www.macktrucks.com, then click on the PARTS AND SERVICE category.

Reinstall and tighten the oil filler plug as follows:

1.Check that the O-ring on the plug is not cut or damaged.

2.Install the plug and tighten to 41–48 N•m (30–35 lb-ft) of torque.

DO NOT exceed 48 N•m (35 lb-ft) as plug can seize, resulting in damage to the transmission case when attempting to remove the plug.