A/T - 2004R/700R4 Oil Pump & Slide Service

SIL 86-27 (Nov)

SUBJECT: 200 R4/700 4R

SERVICE PROCEDURES FOR THE OIL PUMP ROTOR & SLIDE

Beginning mid November, 1983, service parts became available to service the oil pump rotor and slide of the pump body assembly, on all THM 200-4R and 700-R4 transmissions. This service procedure on all THM 200-4R and 700-R4 transmissions must be followed to assure proper end clearance on the oil pump rotor and slide.

SERVICE PROCEDURE:

Note
DO NOT attempt to service the oil pump rotor if either the pump body pocket or pump body cover surfaces are scored. Servicing of the oil pump rotor and slide should be performed ONLY if the selective pump rotor, or the slide show wear.

1. Disassembly of the oil pump:







A. Disassemble the oil pump body assembly following procedures outlined in the service manual. Refer to Figure 1 for the THM 200-4R and Figure 2 for the THM 700-R4 transmission oil pump body assembly.

2. Selecting the pump rotor and slide:




A. Use a micrometer to measure the original pump rotor and slide thickness accurately (Figure 3). To obtain the most accurate reading, measure on flat undamaged surfaces. The oil pump rotor and slides for the THM 200-4R and the THM 700-R4 transmissions are the same.




B. Using the original part measurement, order replacement parts according to the selective charts.

Note
The replacement part will provide the same clearance that the oil pump assembly was originally built with. The proper end clearance specification is 0.020 to 0.050 mm. or (.0008") to (.002") for the 200-4R and the 700-R4.

C. Hone both sides of the replacement rotor and slide to remove any burrs, and measure the replacement parts with a micrometer to assure proper selection.

Note
Incorrect rotor selection could result in a damaged oil pump assembly, and/or low oil pressure. Incorrect slide selection could result in incorrect line pressure.