ROLLER A. 4F2342 - Caterpillar

To prevent personal injury, release the pressure from the hydraulic system before any lines are removed or disconnected.
1. Drain the hydraulic oil tank.2. Open transmission rear cover.3. Remove sixteen bolts (2).4. Disconnect two tubes (1). Cap or plug immediately.5. Disconnect two lines (6). Cap or plug immediately.6. Remove four bolts (7).7. Remove cotter pin (5) (hidden).8. Remove two bolts (3).9. Remove hoist control valve (4). The weight of the hoist control valve is 27 kg (51 lb). For installation of the hoist control valve, reverse the removal steps.10. Fill the hydraulic oil tank to the correct level, refer to the Operation & Maintenance Manual.Disassemble Hoist Control Valve
Start By:a. remove hoist control valve 1. Disconnect line (1) from the relief valve.2. Remove flange (2).3. Remove boot (3) from cover.4. Remove bolts (4) from cover. 5. Turn the control valve body around and remove two bolts (8).6. Remove seal retainer (5). Remove seals (6) from the valve housing.7. Pull main control spool assembly (7) from the valve housing. 8. Remove retainer ring (9) from the cover plate. 9. Remove cover plate (14), spring and spring retainers (18), poppet (13), detent cap (17), spring check valve (12), cover (16), seal and spacer (11), relief valve sleeve (15) and seals and spacer (10) from the main control valve spool (7). 10. Remove line relief valve (19) from the valve housing. 11. Poppet and spring (21) will fall out of relief valve when it is removed.12. Remove relief valve assembly (22) from the valve housing.13. Remove plug (20) from the valve housing. Inspect all O-ring seals on all relief valves and plugs. 14. Remove adjusting nut (25), jam nut (24) and plunger (23) from the body of the line relief valve. 15. Remove circlips (26) and (30) from the relief valve.16. Remove plunger end (28), poppet plunger (27) and spring (29) from the relief valve.Assemble Hoist Control Valve
1. Install spring (29), poppet plunger (27) and plunger end (28) in the relief valve.2. Install circlips (26) and (30) on the relief valve. 3. Install plunger (23) jam nut (24) and adjusting nut (25) in the body of the line relief valve. 4. Install plug (20) in the housing.5. Install relief valve assembly (22) in the valve housing.6. Make sure poppet and spring (21) is installed in the relief valve assembly. 7. Install line relief valve (19) in the valve housing. 8. Install seals and spacer (10), relief valve sleeve (15), seal and spacer (11), cover (16), spring check valve (12), detent cap (17), poppet (13), spring and spring retainers (18) and cover plate (14) on the main control valve spool. 9. Install retainer ring (9) from the cover plate. 10. Install main control valve spool assembly (7) in the valve housing. 11. Install bolts (4) from cover.12. Install boot (3) from cover.13. Install flange (2).14. Connect line (1) to the relief valve.End By:a. install hoist control valve