DRAINING TRANSMISSION

Fluid Analysis. T ransmission protection and fluid change intervals can optimized monitoring fluid oxidation according the tests and limits shown in T able 2–5. Consult your local telephone directory for fluid analysis firms. To make sure consistent and accurate fluid analysis, use only one fluid analysis firm. Refer GN2055EN, T echnician’ s Guide for Automatic T ransmission Fluid for additional information.

T able 2–5. Fluid Analysis Measurement Limits T est Limit

V iscosity ±25 percent change from new fluid T otal Acid Number +3.0 * change from new fluid (Ref. SIL 17TR96) * potassium hydroxide (KOH) neutralize a gram fluid

2–8. TRANSMISSION FLUID CONT AMINA TION

Fluid Examination. At each fluid change, examine the drained fluid for evidence dirt water . A normal amount condensation (not exceed 0.2 percent) will appear in the fluid during operation.

W ater . Obvious water contamination the transmission fluid transmission fluid in the cooler (heat exchanger) water indicates a leak between the water and fluid areas the cooler . Inspect and pressure test the cooler confirm the leak. Replace leaking coolers.

NOTE: Cooler water can also contaminated engine oil; sure locate the correct source cooler water contamination.

Engine Coolant.

CAUTION: Engine coolant in the transmission hydraulic system requires immediate action prevent malfunction and possible serious transmission damage. Completely disassemble, inspect, and clean the transmission. Remove all traces the coolant and varnish deposits resulting from engine coolant contamination (ethylene glycol).