RING-SEAL 6Y8030 - Caterpillar

All Caterpillar Machines With Hydraulic SystemsSome hydraulic system relief valves share many common components but have different pressure settings. These hydraulic system relief valves can be substituted one for another by adjusting the subsutitute relief valve to the desired pressure. The substitute hydraulic relief valve can be adjusted by turning the retainer assembly, adding or removing shims, adding or changing a spring and/or changing or removing a poppet pin. The following charts and illustrations indicate which hydraulic system relief valves can be substituted. Substitution should only be made within the individual groups.
Adjust pressures using the flows indicated in the charts. This can be done on a test bench or, in some cases, by adjusting the engine speed to give the correct flow.
Adjusting relief valve pressure settings to a flow rate that is lower than indicated in the charts (initial opening pressure or "cracking pressure") could result in system pressures that are too high. This could decrease the life of the pump and/or cause structural failure. Higher flows could also cause hydraulic system overheating. Adjusting the relief valves using flow rates that are higher than those indicated in the charts will result in performance complaints when the machine is being operated under normal conditions.
Illustration 1. Relief valve group 1.
Illustration 2. Relief valve group 2.
Illustration 3. Relief valve group 3.
Illustration 4. Relief valve group 4.
Illustration 5. Relief valve group 5. (1) Low pressure shims. (2) High pressure shims.
Illustration 6. Relief valve group 6. (3) 9T-6783 Washer.
Illustration 7. Relief valve group 7.
Illustration 8. Relief valve group 8. (5) Three 8T-0334 Washer.
Illustration 9. Relief valve group 9. (7) 5J-0381 Spacer.
Illustration 10. Relief valve group 10. (8) Dowel, piston or pin. (9) Spring. The 9J-7784 Dowel is 30.0 mm (1.18 in) long, the 7J-2546 Piston is 29.0 mm (1.14 in) long, the 118-5615 Dowel is 28.0 mm (1.10 in) long and the 7B-5684 Pin is 27.0 mm (1.06 in) long.
Illustration 11. Relief valve group 11. (10) 8T-0334 Washers when required.
Illustration 12. Relief valve group 12. (11) 4T-1700 or 125-1393 Spring.
Illustration 13. Relief valve group 13. (12) 5J-9100, 5J-9101 or 5M-3492 Shims. (13) 5J-9104 Spring. The relief valves in this group could be reworked into 5J-9107 or 3G-0773 Relief Valve Groups by removing the inner 5J-9104 Spring and 5M-3492 Shims and adjusting to the pressures given in Chart 15.
Illustration 14. Relief valve group 14. (14) 5J-9101 Shims
Illustration 15. Relief valve group 15. (15) 5J-9100 and 5J-9101 Shims. The relief valves in this group could be reworked into 8J-6089, 9J-0638 or 5J-9106 Relief Valve Groups by adding an inner 5J-9104 Spring and 5M-3492 Shims and adjusting to the pressures given in Chart 15.
Illustration 16. Relief valve group 16. (16) 4T-1008, 4T-0947 and 9T-8048 Relief Valve Group.
Illustration 16a. Relief valve group 16. (17) 104-7574 Relief Valve Group.
Illustration 17. Relief valve group 17. (18) 5J-1036, 5J-2721 and 6J-3993 Shims.
Illustration 18. Relief valve group 18. (19) 8B-4624 Shims.
Illustration 19. Relief valve group 19. (20) 4T-5647 Washer or 9T-4520 Spacer.
Illustration 20. Relief valve group 20. (21) 5J-6153 and 6J-8696