Caterpillar Cat 621S WHEEL SCRAPER (Prefix 2TF) Service Repair Manual Instant Download

w 1/14(W) Product: WHEEL SCRAPER Model: 621E WHEEL SCRAPER 2TF Configuration: 621S TRACTOR/SCRAPER / POWER SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3306 ENGINE Disassembly and Assembly 621S TRACTOR-SCRAPER VEHICLE SYSTEMS Media Number -SENR3673-01 Publication Date -01/05/2005 Date Updated -03/06/2005 SENR36730005 Implement Control Valve SMCS - 5051-010; 5051-015; 5051-016 Remove And Install Implement Control Valve Before any hydraulic lines are removed from the implement control valve, release the pressure in the hydraulic system. Start the engine and move the ejector forward all the way. Stop the engine. Move all scraper control levers. Loosen the cap slowly on the hydraulic tank. 1. Put identification on all hoses, lines and tubes that are connected to the control valve. 2. Disconnect all hoses (1) from the control valve. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 2/14(W) 3. Disconnect linkages (2) from the control valve. Fasten straps and a hoist to the implement control valve. Remove mounting bolts and nuts (3). Remove implement control valve (4). Weight is 39 kg (85 lb.). NOTE: The following steps are for the installation of the implement control valve. 4. Put implement control valve (4) in position with mounting bolts and nuts (3). 5. Control linkages (2) from the control valve. 6. Connect all hoses (1) to the control valve. NOTE: Make sure all hoses are connected to their respective locations. Disassemble Implement Control Valve Start By: a. remove implement control valve 1. Make sure the outside of the valve is clean and free of dirt and foreign material before it is disassembled. 2. Remove two O-ring seals (1) from the valve body for the apron sequence valve group. Check the condition of the seals. If the seals have damage, use new parts for replacement. 3. Remove plug (2). Check the condition of the O-ring seal on the plug. If the seal has damage, use a new part for replacement. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 3/14(W) 4. Remove piston (4), shims (3), spring (6) and valve (5) from the valve body. 5. Remove two bolts (8). Remove the ejector valve spool and spring housing (7) as a unit from the housing. 6. Pull spring housing (7) off the end of ejector valve spool (9) by hand. NOTE: Approximately 265 N (60 lb.) of force is needed to remove the spring housing. 7. Disassemble the ejector valve spool and spring housing as follows: a. Remove detent (14), retainer (16), two O-ring seals (15), retainer (13), spring (12) and washer (11) from the valve spool (10). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

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w 4/14(W) b. Remove screw (19), spring (18) and poppet (17) from the detent. c. Remove spacer (20) from the housing. d. Remove ring (24) with tool (A). Remove retainer (21) and four balls (25). Remove ring (22) with tool (A), ring (26) and spring (23) from the housing. 8. Remove air control valve (27). Turn the valve COUNTERCLOCKWISE to remove it. 9. Remove the O-ring seal from the air control valve. Check the condition of the seal. If the seal has damage, use a new part for replacement. 10. Disassemble the air control valve as follows: a. Remove two bolts and cover (28). Check the condition of the O-ring seal in the cover. If the seal has damage, use a new part for replacement. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 5/14(W) b. Remove piston assembly (29) from the valve body. c. Remove O-ring seal (30) and seal (31) from the piston. d. Remove bushing (32), washer (33) and seal (34) from the valve body. 11. Remove two bolts (35). Remove the apron cylinder valve spool and spring housing as a unit from the control valve housing. 12. Pull spring housing (37) off of apron cylinder spool (36) by hand. NOTE: Approximately 265 N (60 lb.) of force is needed to remove the spring housing. 13. Disassemble the apron cylinder spool and spring housing as follows: https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 6/14(W) a. Put spring (39) under compression until ring (41) can be removed. Release the tension on the spring slowly and remove retainer (40), the spring and retainer (38) from the valve spool. b. Remove ring (42) from the housing with tool (A). Remove retainer (43) and four balls (46). c. Remove ring (47) with tool (A), retainer (44) and spring (45) from the housing. 14. Disassemble the bowl cylinder valve spool as follows: a. Remove two bolts (48) and housing (49). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 7/14(W) b. Remove bowl spool assembly (50) from the control valve housing. c. Put spring (52) under compression and remove ring (55). Release the tension on the spring slowly and remove two spacers (57), spring (54), retainer (53), washer (56) and spring (52) from valve spool (51). 15. Remove two bolts (59) and cover (58) for the relief valve. Check the condition of the O-ring seal in the cover. If the seal has damage, use a new part for replacement. 16. Remove spring (60) and relief valve assembly (61) from the control valve housing. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 8/14(W) 17. Disassemble the relief valve as follows: a. Remove the piston assembly from valve (62). b. Remove pin (68), cap (65), shims (67), spring (64) and valve (66) from piston (63). 18. Remove three O-ring seals (69) from the control valve housing. Check the condition of the seals. If the seals have damage, use a new part for replacement. 19. Remove cover (70) from the control valve housing. 20. Remove seal (71) from the cover. 21. If necessary, remove the other two covers from the control valve housing. 22. Remove seal (72) from the control valve housing. If necessary, remove the other two seals from the housing. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 9/14(W) Assemble Implement Control Valve 1. Make sure all the parts of the scraper hydraulic control valve are clean and free of dirt and foreign material before it is assembled. 2. Install seal (72) in the control valve housing with the lip of the seal toward the inside of the housing. Put clean oil on the lip of the seal. 3. Install the other two seals (72) if they were removed. 4. Install lip type seal (71) in cover (70) with tooling (A). Install the seal with the lip toward the outside of the cover and until it makes contact with the bottom of the counterbore in the cover. 5. Install cover (70) on the control valve housing and the two bolts hold it. Install the other two covers if they were removed. 6. Put clean oil on the lips of the seals. 7. Install three O-ring seals (69). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 10/14(W) 8. Assemble the relief valve for the scraper hydraulic control valve as follows: a. Install valve (66) and spring (64) in piston (63). b. Install shims (67) in cap (65). Install the cap in the piston and pin (68) that holds it. c. Install the piston assembly in valve (62). 9. Install relief valve (61) and spring (60) in the control valve housing. 10. Install the O-ring seal in cover (58). Install the cover and two bolts over the relief valve. 11. Assemble the bowl cylinder valve spool assembly as follows: a. Install spring (52), washer (56) and retainer (53) on valve spool (51). b. Install spring (54) and two spacers (57) in the retainer. Put spring (54) under compression until ring (55) can be installed. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 11/14(W) 12. Put clean oil on the bowl cylinder valve spool assembly. Install bowl cylinder valve spool assembly (50) in the control valve housing. 13. Install the O-ring seal in housing (49). Put housing (49) in position on the control valve housing and install the two bolts that hold it. 14. Assemble the spring housing for the apron cylinder spool assembly as follows: a. Install spring (45) and retainer (44) in the housing. Put spring (45) under compression and install ring (47) with tool (B). b. Install four balls (46) in retainer (43). Install retainer (43) in the housing. Install ring (42) with tool (B). c. Install the O-ring seal in the housing. 15. Assemble the apron cylinder spool assembly as follows: a. Install retainer (38) on the valve spool as shown. Install spring (39) and retainer (40). Put spring (39) under compression until ring (41) can be installed. 16. Install the housing assembly on the apron cylinder spool assembly. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 12/14(W) 17. Put clean oil on the spool assembly. Install the spool assembly and housing assembly in the control valve housing. Install two bolts (35) that hold the unit in position. 18. Assemble the control valve as follows: a. Install lip type seal (34) in the valve body for the air control valve with tooling (A). Install the seal with the lip toward the end of the valve body that has threads and until the seal makes contact with the bottom of the counterbore in the valve body. b. Install washer (33) and bushing (32). c. Install seal (31) and O-ring seal (30) on the piston as shown. Make sure the groove in seal (31) is toward the O-ring seal. d. Install piston assembly (29) in the valve body. e. Install the O-ring seal in cover (28). Install the cover on the valve body. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 13/14(W) 19. Install the washer and air control valve (27). 20. Assemble the spring housing for the ejector valve spool as follows: a. Install spring (23) and ring (26) in the housing. Put spring (23) under compression and install ring (22) with tool (B). b. Install four balls (25) in retainer (21). Install the retainer in the housing. Install ring (24) with tool (B). Install spacer (20) in the housing. 21. Assemble the detent assembly as follows: a. Install poppet (17), spring (18) and screw (19) in the detent. Install the screw until it is approximately 5.1 mm (.20 in.) below the outside surface of the detent. After installation of the Scraper Hydraulic Control Valve Screw (19) make an operational adjustment if necessary. See Operation Checks in Testing and Adjusting Form No. SENR3683. 22. Assemble the ejector valve spool assembly as follows: https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 14/14(W) a. Install washer (11) and spring (12) on valve spool (10). Install two O-ring seals (15) in retainer (13). Install retainer (13) and retainer (16) on the valve spool. b. Install detent assembly (14) in the end of the valve spool. Tighten the detent assembly to a torque of 55 7 N m (40 5 lb.ft.). 23. Install housing assembly (7) on the ejector valve spool assembly. Put clean oil on the valve spool and put the unit in the control valve housing. Install two bolts (8) that hold the unit in position. 24. Assemble the apron sequence valve as follows: a. Install the two O-ring seals in valve body (1). b. Install shims, spring (6) and valve (5) in piston (4). Install the piston assembly in the valve body as shown. c. Install the O-ring seal and plug over the piston assembly. End By: a. install implement control valve https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 1/9(W) Product: WHEEL SCRAPER Model: 621E WHEEL SCRAPER 2TF Configuration: 621S TRACTOR/SCRAPER / POWER SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3306 ENGINE Disassembly and Assembly 621S TRACTOR-SCRAPER VEHICLE SYSTEMS Media Number -SENR3673-01 Publication Date -01/05/2005 Date Updated -03/06/2005 SENR36730006 Implement Hydraulic Pump SMCS - 5055-010; 5055-015; 5055-016 Remove And Install Implement Hydraulic Pump Before any hydraulic lines are disconnected from the hydraulic pump, release the pressure in the hydraulic system and drain the hydraulic tank. Start the engine and move the ejector forward all the way. Stop the engine and loosen the cap on the hydraulic tank slowly. Drain the hydraulic tank. 1. Remove four bolts (2) that hold inlet tube assembly to the pump. 2. Disconnect steering outlet hose assembly (1) from the pump. 3. Disconnect outlet hose (3) from the scraper hydraulic circuit. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 2/9(W) 4. Fasten straps and a hoist to the implement hydraulic pump (4). Remove the nuts that hold the implement hydraulic pump. NOTE: The following steps are for the installation of the implement hydraulic pump. 5. Put the implement hydraulic pump (4) in position with the nuts that hold it. 6. Connect outlet hose (3) to the scraper hydraulic circuit. 7. Connect steering outlet hose assembly (1) from the pump. 8. Install bolts (2) that hold inlet tube assembly to the pump. Disassemble Implement Hydraulic Pump Start By: a. remove implement hydraulic pump NOTE: Make a mark across the cover assembly for correct installation of parts. 1. Remove four bolts (1) from the cover assembly. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 3/9(W) 2. Make a separation of the cover assembly. 3. Make a note of the direction of the rotation arrow on the front cartridge (2) cam ring. Make a mark to show the direction of rotation on the front cover (4). Remove cartridge (2) from the front cover (4) and shaft (3). 4. Remove one O-ring seal (5) and two ring seals (6) from the front cover. Remove the outer bearing retainer from the front cover and remove the bearing, shaft and washer. 5. Remove retainer (7) from the shaft with tool (A). Remove bearing (8) and washer (9). 6. Remove O-ring seal (10). Remove lip type seal (11) from each side of the front cover. Check the condition of the seals. If the parts have damage, use new parts for replacement. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 4/9(W) 7. Remove O-ring seal (13) and seal ring (12) from the cartridge. 8. Remove two socket head bolts (16) and make a separation of the cartridge assembly. Make a note of the direction of the rotation arrows on cam ring (15) and rotor (14). 9. Remove two seal and retainer assemblies (17) from each end plate (18). 10. Remove and inspect O-ring seal (19) from each retainer (20). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 5/9(W) NOTE: The sharp edge of vane (22) goes toward the direction of rotation of rotor (14). 11. Remove ten vanes (22) and ten vane inserts (21). 12. Make a note of the direction of rotation arrow on the rear cartridge (23) cam ring. Make a mark on the rear cover (26). Remove O-ring seal (24) and seal ring (25) from the rear cartridge. Remove O-ring seal (27) and two ring seals (28) from the rear cover. 13. Disassemble the rear cartridge assembly (23) as in Steps 8 through 11. Assemble Implement Hydraulic Pump 1. Install O-ring seal (10) in the front cover. Install small lip type seal (11) in the cover with tooling (A). Install the seal with the lip toward the inside of the pump and until it is even with the outside surface of the front cover. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 6/9(W) 2. Turn the cover over. Install the large lip type seal in the cover with tooling (A). Install the seal with the lip toward the inside of the pump and until it makes contact with the bottom of the counterbore. 3. Heat bearing (8) to a maximum temperature of 135 C (275 F) and install it on the shaft. Install retainer (7) with tool (B). Install washer (9) on the shaft as shown. 4. Install the shaft, bearing and washer in the front cover. Install the outer bearing retainer in the front cover. Install two ring seals (6) and O-ring seal (5) in the front cover. 5. Install O-ring seal (19) in each retainer (20). 6. Install two seal and retainer assemblies (17) in each end plate (18). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 7/9(W) NOTE: The sharp edge of vanes (22) go toward the direction of rotation of rotor (14). 7. Install vane insert (21) in each vane (22). Install vane and vane insert assemblies in rotor (14) as shown. 8. Assemble the front cartridge as follows: NOTE: The rotation arrows on cam ring (15) and rotor (14) must be in the same direction. a. Install the rotor and vane assembly in the cam ring. b. Put the two wear plates in position with the bronze side of the wear plate toward the cam ring. c. Put the two end plates in position and install but do not tighten the two socket head bolts (16). 9. Put the cartridge elements in alignment as follows: a. Tighten the two bolts (16) by hand to hold the cartridge assembly together. b. Put the cartridge in the center cover. c. With the cartridge in the center cover, tighten the two socket head bolts (16). NOTE: The O-ring seal is toward the side of the groove that is toward the center of the cartridge. 10. Install O-ring seal (13) and ring (12) on the cartridge. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 8/9(W) NOTE: The marks that show the direction of rotation on the cam ring and the front cover must be installed with the marks in the same direction. 11. Install cartridge (2) in the shaft and front cover assembly. 12. Assemble the rear cartridge as in Steps 6 through 10. 13. Install two ring seals (28) and O-ring seals (27) in rear cover (26). NOTE: The marks that show the direction of rotation on the cam ring and the rear cover must be in the same direction at assembly. 14. Install rear cartridge (23) in rear cover (26). NOTE: Make sure the dowels are in alignment with the holes in the center cover. 15. Put both front and rear cartridges and cover assemblies in the center cover. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 9/9(W) 16. Install four bolts (1) that hold the pump together. End By: a. install implement hydraulic pump https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 1/10(W) Product: WHEEL SCRAPER Model: 621E WHEEL SCRAPER 2TF Configuration: 621S TRACTOR/SCRAPER / POWER SHIFT / 2TF00001-00971 (MACHINE) POWERED BY 3306 ENGINE Disassembly and Assembly 621S TRACTOR-SCRAPER VEHICLE SYSTEMS Media Number -SENR3673-01 Publication Date -01/05/2005 Date Updated -03/06/2005 SENR36730007 Steering Control Valve And Crossover Relief Valve SMCS - 4307-010; 4307-015; 4307-016 Remove And Install Steering Control Valve And Crossover Relief Valve Before any hydraulic lines are disconnected, release the pressure from the hydraulic system. Start the engine and move the ejector forward all the way. Stop the engine and loosen the cap on the hydraulic tank slowly. Move all the hydraulic controls backward and forward. NOTE: Location of the steering control valve and crossover relief valve is directly beneath the operator's compartment. 1. Remove bolts (1) and swing access panel (2) back. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 2/10(W) 2. Disconnect all tubes and hoses (3) from the steering control valve and crossover relief valve. 3. Remove the guard plate directly beneath the operator's compartment. 4. Remove bolts (4), (5) and (6). Slide the valve and bracket forward, and lower the steering control valve and crossover relief valve down with a suitable hoist. Weight of the valve group is 72 kg (160 lb.). NOTE: The following steps are for the installation of the steering control valve and crossover relief valve. 5. Put steering control valve and crossover relief valve in position with bolts (4), (5) and (6). 6. Install guard plate. 7. Connect all tubes and hoses (3) to the steering control valve and crossover relief valve. 8. Close access panel (2) and install bolts (1). Disassemble Steering Control Valve And Crossover Relief Valve Start By: a. remove steering control valve and crossover relief valve. NOTE: For disassembly of the crossover relief valve, only do Steps 1 through 9. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 3/10(W) 1. Remove bolts (2) and crossover relief valve (1) from steering control valve (3). If necessary, remove the O-ring seals from the crossover relief valve. 2. Remove plugs (4), springs (5) and balls (6) from both ends of crossover relief valve (1). If necessary; remove O-ring seals (7) from plugs (4). 3. Remove relief valves (9) from both ends of crossover relief valve (1). 4. Remove the rings and O-rings (11) and (10) from relief valves (9). 5. Carefully remove caps (8) and gaskets (12) from relief valves (9). 6. Put identification marks on check valves (13) and (14) as to their location in crossover relief valve (1). Remove check valve assemblies (13) and (14) from the crossover relief valve. 7. Use tool (A), and remove snap rings (15) from valve bodies (19). 8. Remove spacers (16), springs (17) and balls (18) from valve bodies (19). 9. Remove plugs (21) and stems (20) from valve bodies (19). If necessary, remove O-ring seals (22) and (23) from the valve bodies and the plugs. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 4/10(W) 10. Remove plug (27), shims (26), rod (25), spring (24) and valve (28) from the steering control valve. If necessary, remove O-ring seal (29) from plug (27). 11. Remove bolts (30) and cover (31) from steering control valve (3). 12. Remove seat (32) from cover (31). If necessary, remove O-ring seals (33) and (34) from cover (31) and seat (32). 13. Remove valve (35), shims (36), springs (37) and (38), spring (40), strainer (39) and spool (41) from steering control valve (3). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

w 5/10(W) 14. Remove bolt (46), retainer (45), spring (44), spacer (43), retainer (47) and shims (42) from spool (41). 15. Use tool (B), and remove snap ring (48) from spool (41). 16. Remove one of the plugs from separator (51), and install a 5/16" - 24 NF bolt (52). Use bolt (52) to remove separator (51) from spool (41). 17. Remove rings (50) and O-ring seals (49) from separator (51). 18. Remove plug (55), shims (54), spring (53) and stem (57) from the steering control valve. 19. Remove O-ring seal (56) from plug (55). https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

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w 6/10(W) 20. Remove bolts (59) and cover (58) from the steering control valve. Remove the O-ring seals from the cover. 21. Remove valve (60) and spacer (61) from the steering control valve. 22. Remove O-ring seals (62) from the valve and spacer. 23. If necessary, remove plug (63) and the O-ring seal from valve (60). Assemble Steering Control Valve And Crossover Relief Valve 1. Inspect all parts of the steering control valve and crossover relief valve for wear or damage, and make a replacement if necessary. NOTE: For assembly of the crossover relief valve, only do Steps 21-30. https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/siswe... 2021/4/6

https://www.ebooklibonline.com Hello dear friend! Thank you very much for reading. Enter the link into your browser. The full manual is available for immediate download. https://www.ebooklibonline.com