3557763 INSULATOR Caterpillar parts
305D CR
Rating:
Alternative (cross code) number:
CA3557763
355-7763
3557763
CA3557763
355-7763
3557763
Weight: 0.09 pounds 0 kg.
MINI HYD EXCAVATOR,
Compatible equipment models: 3557763:
Number on catalog scheme:
9
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Information:
Limitation Of Pressure In Circuit
Two types of relief valves are installed on the main control valves in order to limit the pressure in the hydraulic circuit.
The main relief valve limits the pressure in the main hydraulic system.
The line relief valve limits the pressure which is built into the cylinder circuits.Main Relief Valve
Illustration 1 g03424058
Straight travel control valve and main relief valve (sectional view) (1) Main control valve (2) Right travel control valve (3) Straight travel control valve (4) Check valve (5) Check valve (6) Passage (7) Pilot pump (8) Drive pump (9) Heavy lift solenoid valve (10) Main relief valve (11) Passage (12) Line (13) Idler pump (14) Line (15) Line (16) Pilot manifold (17) LineOil from drive pump (8) and idler pump (13) enters main control valve (1) through lines (15) and (14). Drive pump oil and idler pump oil goes through check valves (5) and (4) to passage (6). The higher oil pressure from the drive pump or the idler pump goes through passage (6) to main relief valve (10). CLOSED Position (Heavy Lift OFF)
Illustration 2 g02796283
Main relief valve (CLOSED) (6) Passage (18) Valve (19) Spring chamber (20) Spring (21) Valve (22) Spring (23) Passage (24) OrificeWhen main pump oil pressure in passage (6) is less than the main relief pressure setting, valve (18) and valve (21) are closed by the force of spring (20) and spring (22). The oil in passage (6) goes through orifice (24). Oil enters spring chamber (19). The pressure in passage (6) and the pressure in spring chamber (19) are equal. Valve (18) shifts left by the force of spring (20). Valve (18) closes passage (23). There is no oil flow from passage (6) to return passage (25). OPEN Position (Heavy Lift OFF)
Illustration 3 g02796285
Main relief valve (OPEN) (6) Passage (18) Valve (19) Spring chamber (20) Spring (21) Valve (22) Spring (23) Passage (24) Orifice (25) Return passage (26) Passage (27) ChamberOil pressure in passage (6) nears the relief pressure setting. Oil pressure in passage (6) overcomes the force of spring (22). The oil pressure opens valve (21). The oil in valve chamber (27) goes through passage (26) to return passage (25). The oil is called low-pressure oil. The oil pressure from passage (6) decreases at orifice (24). The oil then goes through spring chamber (19) to valve chamber (27). Because of the decreased oil pressure in spring chamber (19), the oil pressure from passage (6) pushes valve (18) to the right against the force of spring (20). Passage (23) now opens allowing the high-pressure oil flow from passage (6) to return passage (25) .Heavy Lift Operation
Illustration 4 g02796286
(6) Passage (18) Valve (19) Spring chamber (20) Spring (21) Valve (22) Spring (23) Passage (24) Orifice (25) Return passage (26) Passage (27) Chamber (28) Port (29) Passage (30) Piston
Illustration 5 g03746693
Switch Panel (right console) (31) Heavy lift switchWhen the heavy lift switch (31) is placed in the ON position, heavy lift solenoid (9) shifts. Pilot oil now flows from pilot manifold (16) through solenoid (9), line (11),
Two types of relief valves are installed on the main control valves in order to limit the pressure in the hydraulic circuit.
The main relief valve limits the pressure in the main hydraulic system.
The line relief valve limits the pressure which is built into the cylinder circuits.Main Relief Valve
Illustration 1 g03424058
Straight travel control valve and main relief valve (sectional view) (1) Main control valve (2) Right travel control valve (3) Straight travel control valve (4) Check valve (5) Check valve (6) Passage (7) Pilot pump (8) Drive pump (9) Heavy lift solenoid valve (10) Main relief valve (11) Passage (12) Line (13) Idler pump (14) Line (15) Line (16) Pilot manifold (17) LineOil from drive pump (8) and idler pump (13) enters main control valve (1) through lines (15) and (14). Drive pump oil and idler pump oil goes through check valves (5) and (4) to passage (6). The higher oil pressure from the drive pump or the idler pump goes through passage (6) to main relief valve (10). CLOSED Position (Heavy Lift OFF)
Illustration 2 g02796283
Main relief valve (CLOSED) (6) Passage (18) Valve (19) Spring chamber (20) Spring (21) Valve (22) Spring (23) Passage (24) OrificeWhen main pump oil pressure in passage (6) is less than the main relief pressure setting, valve (18) and valve (21) are closed by the force of spring (20) and spring (22). The oil in passage (6) goes through orifice (24). Oil enters spring chamber (19). The pressure in passage (6) and the pressure in spring chamber (19) are equal. Valve (18) shifts left by the force of spring (20). Valve (18) closes passage (23). There is no oil flow from passage (6) to return passage (25). OPEN Position (Heavy Lift OFF)
Illustration 3 g02796285
Main relief valve (OPEN) (6) Passage (18) Valve (19) Spring chamber (20) Spring (21) Valve (22) Spring (23) Passage (24) Orifice (25) Return passage (26) Passage (27) ChamberOil pressure in passage (6) nears the relief pressure setting. Oil pressure in passage (6) overcomes the force of spring (22). The oil pressure opens valve (21). The oil in valve chamber (27) goes through passage (26) to return passage (25). The oil is called low-pressure oil. The oil pressure from passage (6) decreases at orifice (24). The oil then goes through spring chamber (19) to valve chamber (27). Because of the decreased oil pressure in spring chamber (19), the oil pressure from passage (6) pushes valve (18) to the right against the force of spring (20). Passage (23) now opens allowing the high-pressure oil flow from passage (6) to return passage (25) .Heavy Lift Operation
Illustration 4 g02796286
(6) Passage (18) Valve (19) Spring chamber (20) Spring (21) Valve (22) Spring (23) Passage (24) Orifice (25) Return passage (26) Passage (27) Chamber (28) Port (29) Passage (30) Piston
Illustration 5 g03746693
Switch Panel (right console) (31) Heavy lift switchWhen the heavy lift switch (31) is placed in the ON position, heavy lift solenoid (9) shifts. Pilot oil now flows from pilot manifold (16) through solenoid (9), line (11),
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2821656
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3243948
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312C L
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3054894
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312C L
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2014548
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305.5E, 307E, 308C, 308D, 308E, 308E CR, 308E SR, 308E2 CR, 314C, 314D LCR, 321C, 321D LCR, 325C, 328D LCR
305.5E, 307E, 308C, 308D, 308E, 308E CR, 308E SR, 308E2 CR, 314C, 314D LCR, 321C, 321D LCR, 325C, 328D LCR
305.5E, 307E, 308C, 308D, 308E, 308E CR, 308E SR, 308E2 CR, 314C, 314D LCR, 321C, 321D LCR, 325C, 328D LCR
2457828
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307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
2457827
INSULATOR
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
2457826
INSULATOR
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
2457825
INSULATOR
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
307D, 311D LRR, 311F LRR, 312D, 312D L, 312D2, 312D2 GC, 312D2 L, 313D, 313D2, 313D2 LGP, 315D L, 318D L, 318D2 L, 319D, 319D L, 319D LN, 320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR,...
3214990
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307D, 308D
307D, 308D
3214989
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307D, 308D
307D, 308D