MODULE 1C4319 - Caterpillar

Introduction
This procedure should be performed if the machine will shift freely between all FORWARD gears, but will not move when shifted into any REVERSE gear. Step 1. Check transmission clutch pressure.a. With the engine running and the parking brake disengaged, shift the transmission into reverse.b. Check the pressure on clutch 2 (14B).
Figure 1: Transmission Controls
(14) Modulating valve. (14A) Clutch one (modulating valve). (14B) Clutch two (modulating valve). (14C) Clutch three (modulating valve). (14D) Clutch four (modulating valve). (14E) Clutch five (modulating valve). Expected Result: The pressure is less than 20 psi. Results:* OK - Proceed to Step 3.* NOT OK - Proceed to Step 2. Step 2. Inspect transmission modulating valve.a. Disassemble and inspect the transmission modulating valve for clutch 2.b. Repair as required.c. Return the valve to its original position.d. Check operation of machine for original complaint. Expected Result: The original complaint is resolved. Results:* OK - Calibrate the transmission modulating valve