HEATER GP-JACKET WATER 3738633 - Caterpillar

Do not disconnect the air line from the actuator valve until the air pressure is zero.
2. Disconnect hose assembly (2) from parking brake release valve (6). Disconnect the hose assembly (1) from the top of the differential lock control valve (3). Disconnect wire (5) from the wiring harness. Remove two bolts and the differential lock control valve (3) from the differential case. Make a note of the O-ring that is under the differential lock control valve. Replace if necessary. The following steps are for installation of the differential lock actuator valve.3. Install the O-ring in the differential lock actuator valve.4. Position differential lock actuator valve (3) on the differential case. Install bolts (4) and hose assemblies (1) and (2). Connect electrical harness (5).