2754838 TUBE AS Caterpillar parts
AD45B
Rating:
Alternative (cross code) number:
CA2754838
275-4838
2754838
CA2754838
275-4838
2754838
Weight: 5 pounds 2 kg.
UNDERGROUND ART TRUCK,
Compatible equipment models: 2754838:
Information:
Boom Priority
Illustration 5 g03405700
Hydraulic schematic for BOOM RAISE and STICK IN
(1) Boom cylinders
(4) Pilot control valve (bucket and boom)
(6) Pressure reducing valve for boom priority
(43) Stick II control valve
(44) Pilot control valve (stick and swing) During combined operations of BOOM RAISE and STICK IN, the pilot oil pressure from the pilot control valve for the boom (4) activates the pressure reducing valve for boom priority (6). Pressure reducing valve for boom priority (6) causes oil flow priority to the head end of the boom cylinders (1) during this combined hydraulic operation.When the joystick for the stick is moved to the STICK IN position, a portion of the pilot oil from the pilot control valve for the stick (46) flows through the pressure reducing valve for the boom priority (6) to the stick II control valve (43). As the joystick for the boom is moved farther from the NEUTRAL position during a BOOM RAISE operation, pilot oil pressure from the pilot control valve for the boom (4) increases. This gradual increase in pilot oil pressure causes the spool in the pressure reducing valve for the boom priority (6) to shift gradually.A portion of the pilot oil that flows to stick II control valve (43) from the pilot control valve for the stick (44) is routed to the hydraulic tank. The pilot oil pressure that acts on stick II control valve (43) decreases. Stick II control valve (43) shifts toward the NEUTRAL position. The amount of oil flow from the main pumps to the stick hydraulic circuit decreases. This action causes a greater portion of the oil flow from the main pumps to flow to the head end of the boom cylinders (1).Since the pilot oil pressure from the pilot control valve for the boom (4) directly corresponds to the amount of movement or position of the joystick a gradual change to boom priority occurs. Thus, boom priority is controlled by the position of the joystick for the boom and boom priority automatically activates when the joystick reaches a certain position during a BOOM RAISE operation.Boom Lower
Illustration 6 g03406196
Hydraulic schematic for BOOM LOWER
(1) Boom cylinders
(2) Line (oil flow from boom cylinder rod end)
(3) Line (oil flow to boom cylinder head end)
(4) Pilot control valve (bucket and boom)
(5) Drain line
(6) Spool (boom regeneration valve)
(7) Valve
(8) Boom drift reduction valve
(9) Drain line
(10) Passage
(11) Center bypass passage
(12) Parallel feeder passage
(13) Load check valve
(14) Return passage
(15) Control valve (boom I)
(16) Orifice
(17) Boom regeneration valve
(18) Control valve (stick II)
(19) Line
(20) Port
(21) Pilot line
(23) Drive pump
(24) Idler pump
(25) Pilot pump Introduction
When the boom is lowered, oil from drive pump (23) is supplied to boom cylinders (1) through control valve (15).The BOOM LOWER operation contains a regeneration circuit. When the joystick for the boom is moved to the BOOM LOWER position, orifice (16) in boom I control valve (15) and boom regeneration valve (17) are operational in the boom hydraulic circuit. The return oil flow from the head end of boom cylinders (1) flows through boom regeneration valve (8)
Illustration 5 g03405700
Hydraulic schematic for BOOM RAISE and STICK IN
(1) Boom cylinders
(4) Pilot control valve (bucket and boom)
(6) Pressure reducing valve for boom priority
(43) Stick II control valve
(44) Pilot control valve (stick and swing) During combined operations of BOOM RAISE and STICK IN, the pilot oil pressure from the pilot control valve for the boom (4) activates the pressure reducing valve for boom priority (6). Pressure reducing valve for boom priority (6) causes oil flow priority to the head end of the boom cylinders (1) during this combined hydraulic operation.When the joystick for the stick is moved to the STICK IN position, a portion of the pilot oil from the pilot control valve for the stick (46) flows through the pressure reducing valve for the boom priority (6) to the stick II control valve (43). As the joystick for the boom is moved farther from the NEUTRAL position during a BOOM RAISE operation, pilot oil pressure from the pilot control valve for the boom (4) increases. This gradual increase in pilot oil pressure causes the spool in the pressure reducing valve for the boom priority (6) to shift gradually.A portion of the pilot oil that flows to stick II control valve (43) from the pilot control valve for the stick (44) is routed to the hydraulic tank. The pilot oil pressure that acts on stick II control valve (43) decreases. Stick II control valve (43) shifts toward the NEUTRAL position. The amount of oil flow from the main pumps to the stick hydraulic circuit decreases. This action causes a greater portion of the oil flow from the main pumps to flow to the head end of the boom cylinders (1).Since the pilot oil pressure from the pilot control valve for the boom (4) directly corresponds to the amount of movement or position of the joystick a gradual change to boom priority occurs. Thus, boom priority is controlled by the position of the joystick for the boom and boom priority automatically activates when the joystick reaches a certain position during a BOOM RAISE operation.Boom Lower
Illustration 6 g03406196
Hydraulic schematic for BOOM LOWER
(1) Boom cylinders
(2) Line (oil flow from boom cylinder rod end)
(3) Line (oil flow to boom cylinder head end)
(4) Pilot control valve (bucket and boom)
(5) Drain line
(6) Spool (boom regeneration valve)
(7) Valve
(8) Boom drift reduction valve
(9) Drain line
(10) Passage
(11) Center bypass passage
(12) Parallel feeder passage
(13) Load check valve
(14) Return passage
(15) Control valve (boom I)
(16) Orifice
(17) Boom regeneration valve
(18) Control valve (stick II)
(19) Line
(20) Port
(21) Pilot line
(23) Drive pump
(24) Idler pump
(25) Pilot pump Introduction
When the boom is lowered, oil from drive pump (23) is supplied to boom cylinders (1) through control valve (15).The BOOM LOWER operation contains a regeneration circuit. When the joystick for the boom is moved to the BOOM LOWER position, orifice (16) in boom I control valve (15) and boom regeneration valve (17) are operational in the boom hydraulic circuit. The return oil flow from the head end of boom cylinders (1) flows through boom regeneration valve (8)
Parts tube Caterpillar catalog:
4N1216
TUBE-COOLER BYPASS
16G, 16H NA, 245B, 24M, 3406, 3406B, 3406C, 3406E, 375, 375 L, 5080, 578, 583R, 583T, 587R, 587T, 621B, 621E, 621F, 621G, 623E, 623F, 623G, 627E, 627F, 627G, 631D, 631E, 631G, 633E II, 637D, 637E, 637...
16G, 16H NA, 245B, 24M, 3406, 3406B, 3406C, 3406E, 375, 375 L, 5080, 578, 583R, 583T, 587R, 587T, 621B, 621E, 621F, 621G, 623E, 623F, 623G, 627E, 627F, 627G, 631D, 631E, 631G, 633E II, 637D, 637E, 637...
2748359
TUBE AS
24M, 385C, 385C FS, 385C L, 385C L MH, 390D, 390D L, 390F L, 631E, 631G, 633E II, 637E, 637G, 657E, 657G, 772, 772G, 772G OEM, 834H, 834K, 836H, 836K, 988H, 988K, AD45B, AD55, C18, C18 I6, CX31-C18I, ...
24M, 385C, 385C FS, 385C L, 385C L MH, 390D, 390D L, 390F L, 631E, 631G, 633E II, 637E, 637G, 657E, 657G, 772, 772G, 772G OEM, 834H, 834K, 836H, 836K, 988H, 988K, AD45B, AD55, C18, C18 I6, CX31-C18I, ...
5M6212
TUBE
14E, 30/30, 572G, 611, 615, 615C, 621, 621B, 621E, 621F, 621G, 621H, 621K, 621R, 623, 623B, 623E, 623F, 623G, 623H, 623K, 623K LRC, 627B, 627E, 627F, 627G, 627H, 627K, 627K LRC, 637E, 69D, 735, 735B, ...
14E, 30/30, 572G, 611, 615, 615C, 621, 621B, 621E, 621F, 621G, 621H, 621K, 621R, 623, 623B, 623E, 623F, 623G, 623H, 623K, 623K LRC, 627B, 627E, 627F, 627G, 627H, 627K, 627K LRC, 637E, 69D, 735, 735B, ...
8P8837
TUBE AS
24H, 24M, 824C, 824G, 824G II, 824H, 825G, 825G II, 825H, 826C, 826G, 826G II, 826H, 834B, 834G, 834H, 836, 836G, 836H, 980C, 980F, 980F II, 980G, 980G II, 980H, 980K, 980K HLG, 988B, 988F, 988F II, A...
24H, 24M, 824C, 824G, 824G II, 824H, 825G, 825G II, 825H, 826C, 826G, 826G II, 826H, 834B, 834G, 834H, 836, 836G, 836H, 980C, 980F, 980F II, 980G, 980G II, 980H, 980K, 980K HLG, 988B, 988F, 988F II, A...
1540930
TUBE AS
834G, 834H, 988G, 988H, AD45B, AD55, AD55B, AD60
834G, 834H, 988G, 988H, AD45B, AD55, AD55B, AD60
2376517
TUBE
AD45B, AD55
AD45B, AD55
2530460
TUBE AS
AD45B, AD55
AD45B, AD55
2389979
TUBE-EXHAUST
AD45B, AD55
AD45B, AD55
2754835
TUBE AS
AD45B
AD45B
2754839
TUBE AS
AD45B
AD45B
2754840
TUBE AS
AD45B
AD45B
2754841
TUBE AS
AD45B
AD45B
2754837
TUBE AS
AD45B
AD45B
2754836
TUBE AS
AD45B
AD45B
2754835
TUBE AS
AD45B
AD45B
2754834
TUBE AS
AD45B
AD45B
2702810
TUBE
AD45B
AD45B
2733581
TUBE AS
AD45B
AD45B
2754844
TUBE AS
AD45B
AD45B
2754843
TUBE AS
AD45B
AD45B
2754842
TUBE AS
AD45B
AD45B
2754841
TUBE AS
AD45B
AD45B
2754840
TUBE AS
AD45B
AD45B
2754839
TUBE AS
AD45B
AD45B