SEAL-LIP TYPE 3G1221 - Caterpillar

1. Move the ejector forward and turn the engine "OFF".
To prevent possible personal injury, make sure the air pressure in the system is zero before any lines are disconnected.
2. Disconnect four oil lines (2) and airline (1) from the control valve.3. Remove three bolts (3) and control valve (4) from the transmission housing. The following steps are for the installation of the retarder control valve.4. Put control valve (4) in position on the transmission housing, and install three bolts (3).5. Connect airline (1) to the valve.6. Connect four oil lines (2) to control valve (4).7. Check the oil level in the transmission. Fill as necessary.8. Move the ejector to the rear.Disassemble & Assemble Retarder Control Valve
Start By:a. remove retarder control valve 1. Remove bolts and washers (2), and remove cover (1). Remove seal (3) from body (7).2. Remove spool (5) from body (7). Remove slug (4), spring (6), stop (8), and spring (9) from the spool. Remove bolt (12), stud (11), and pin (13) from the spool.3. Remove bolts and washers (10), and remove cover (15). Remove plug (14) from the cover.4. Remove diaphragm (16) from the body. Remove the plug, seal, spring and plunger from the threaded hole in the body connecting with passage (17). The following steps are for the assembly of the retarder control valve.5. Clean and inspect all parts. Make a replacement of all parts that are worn or damaged.6. Install the plunger, spring, seal and plug in the threaded hole connecting with passage (17) in body (7). Install diaphragm (16) in the body. 7. Install plug (14) in cover (15). Install the cover with bolts and washers (10).8. Install pin (13), stud (11) and bolt (12) in spool (5). Install spring (9), stop (8), spring (6) and slug (4) in the spool. Install the spool in body (7).9. Install seal (3) in body (7). Install cover (1) and bolts and washers (2).End By:a. install retarder control valve