3032904 TUBE AS Caterpillar parts
330D L, 330D LN
Rating:
Alternative (cross code) number:
CA3032904
303-2904
3032904
CA3032904
303-2904
3032904
EXCAVATOR,
Number on catalog scheme:
16
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Information:
Left Side Piston Pump
Illustration 1 g01317784
Left side drive loop (1) Actuator piston (2) Feedback lever (3) Solenoid (4) Passage (5) Servo valve (6) Port for the drive loop (7) Input shaft (8) Swashplate (9) Piston (10) Barrel (11) Spring (12) Port Plate (13) Port for drive loop (14) Adapter groupThe tandem pumps for the hydrostatic drive system are variable displacement piston pumps. The tandem pumps are mounted to the rear of the engine. The input shaft of the front pump engages a coupling that is mounted to the flywheel of the engine in order to drive the tandem pumps. When the engine is running, shaft (7) and barrel (10) are rotating. There are nine pistons (9) in barrel (10). Port plate (12) and swashplate (8) are stationary within the pump housing. Port plate (12) and swashplate (8) do not rotate. Spring (11) maintains a force against barrel (10) and port plate (12). When barrel (10) is rotating, each piston (9) follows the angle of swashplate (8) .If the angle of swashplate (8) is zero, pistons (9) do not move in and out of barrel (10) and there is no oil flow. Pilot oil from the fan motor maintains oil pressure in the pump in order to perform the following tasks:
Keep barrel (10) full of oil.
Lubricate the pump components.
Provide makeup oil for internal loss of oil that is due to leakage.
Provide pilot oil to servo valve (5) in order to shift actuator piston (1) and change the angle of swashplate (8) .
The fan pump provides pilot oil in order to release the parking brakes.The position of swashplate (8) is determined by actuator piston (1). The transmission control lever that is located on the left console sends signals to the electronic control module (ECM). The ECM interprets the signals and the ECM sends pulse width modulated signals to solenoids (3) on either side of servo valve (5). As servo valve (5) is shifted to either direction, signal oil gets filtered through the pilot oil screens. The signal oil then travels through passage (4) to the corresponding end of actuator piston (1) .As actuator piston (1) begins to move, the angle of swashplate (8) begins to increase. As piston (9) follows swashplate (8), pistons (9) begin to move in and out of barrel (10). As piston (9) moves out of barrel (10), oil is drawn from the passage of port (6) of the drive loop through port plate (12). As piston (9) follows swashplate (8) and the piston moves into barrel (10), the oil is pushed through port plate (12) into the passage to port (13) of the drive loop.As the angle of swashplate (8) increases, the output flow of the pump also increases.Right Side Piston Pump
Illustration 2 g01317716
Right side drive loop (1) Actuator piston (2) Feedback lever (3) Solenoid (4) Passage (5) Servo valve (6) Port for the drive loop (7) Input shaft (8) Swashplate (9) Piston (10) Barrel (11) Spring (12) Port Plate (13) Port for drive loop (15) Charge pump
Illustration 1 g01317784
Left side drive loop (1) Actuator piston (2) Feedback lever (3) Solenoid (4) Passage (5) Servo valve (6) Port for the drive loop (7) Input shaft (8) Swashplate (9) Piston (10) Barrel (11) Spring (12) Port Plate (13) Port for drive loop (14) Adapter groupThe tandem pumps for the hydrostatic drive system are variable displacement piston pumps. The tandem pumps are mounted to the rear of the engine. The input shaft of the front pump engages a coupling that is mounted to the flywheel of the engine in order to drive the tandem pumps. When the engine is running, shaft (7) and barrel (10) are rotating. There are nine pistons (9) in barrel (10). Port plate (12) and swashplate (8) are stationary within the pump housing. Port plate (12) and swashplate (8) do not rotate. Spring (11) maintains a force against barrel (10) and port plate (12). When barrel (10) is rotating, each piston (9) follows the angle of swashplate (8) .If the angle of swashplate (8) is zero, pistons (9) do not move in and out of barrel (10) and there is no oil flow. Pilot oil from the fan motor maintains oil pressure in the pump in order to perform the following tasks:
Keep barrel (10) full of oil.
Lubricate the pump components.
Provide makeup oil for internal loss of oil that is due to leakage.
Provide pilot oil to servo valve (5) in order to shift actuator piston (1) and change the angle of swashplate (8) .
The fan pump provides pilot oil in order to release the parking brakes.The position of swashplate (8) is determined by actuator piston (1). The transmission control lever that is located on the left console sends signals to the electronic control module (ECM). The ECM interprets the signals and the ECM sends pulse width modulated signals to solenoids (3) on either side of servo valve (5). As servo valve (5) is shifted to either direction, signal oil gets filtered through the pilot oil screens. The signal oil then travels through passage (4) to the corresponding end of actuator piston (1) .As actuator piston (1) begins to move, the angle of swashplate (8) begins to increase. As piston (9) follows swashplate (8), pistons (9) begin to move in and out of barrel (10). As piston (9) moves out of barrel (10), oil is drawn from the passage of port (6) of the drive loop through port plate (12). As piston (9) follows swashplate (8) and the piston moves into barrel (10), the oil is pushed through port plate (12) into the passage to port (13) of the drive loop.As the angle of swashplate (8) increases, the output flow of the pump also increases.Right Side Piston Pump
Illustration 2 g01317716
Right side drive loop (1) Actuator piston (2) Feedback lever (3) Solenoid (4) Passage (5) Servo valve (6) Port for the drive loop (7) Input shaft (8) Swashplate (9) Piston (10) Barrel (11) Spring (12) Port Plate (13) Port for drive loop (15) Charge pump
Caterpillar parts catalog:
Parts tube Caterpillar catalog:
1090, 1190, 1190T, 120H, 120H ES, 120K, 120K 2, 120M, 120M 2, 1290T, 12H, 12H ES, 12K, 12M, 130G, 135H, 1390, 140H, 140H ES, 140K, 140K 2, 140M, 143H, 14H, 14H NA, 160H, 160H ES, 160K, 160M, 163H, 16H...
12H, 140M, 140M 2, 160M, 160M 2, 2290, 2390, 2391, 2491, 2590, 330C, 330C FM, 330C L, 330C MH, 330D, 330D FM, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 336D2, 336D2 L, 340D L, 340D2 L, 511, 521...
12H, 330C, 330C FM, 330C L, 330C MH, 330D, 330D FM, 330D L, 330D LN, 330D MH, 336D, 336D L, 336D LN, 340D L, 627G, 637D, 637G, 973C, 973D, C-9, C9, D6R II, M330D, MTC735, TK711, TK721, TK722, TK732, T...
2296866
TUBE AS
330C, 330C L, 330D L, 330D LN, 336D L
330C, 330C L, 330D L, 330D LN, 336D L
2169960
TUBE AS
325C, 325D L, 330C, 330D L
325C, 325D L, 330C, 330D L
2452184
TUBE AS
330D FM, 330D L, 330D LN, 336D, 336D L, 336D LN, 336D2, 336D2 L
330D FM, 330D L, 330D LN, 336D, 336D L, 336D LN, 336D2, 336D2 L
2452196
TUBE AS
330D FM, 330D L, 330D LN, 336D, 336D L, 336D LN, 336D2, 336D2 L
330D FM, 330D L, 330D LN, 336D, 336D L, 336D LN, 336D2, 336D2 L
2452290
TUBE AS
330D L, 330D LN
330D L, 330D LN
2623207
TUBE AS
330D L, 330D LN
330D L, 330D LN
3568100
TUBE AS
330D L, 330D LN, 336D, 336D L, 336D LN, 336D2, 336E LH, 336E LN
330D L, 330D LN, 336D, 336D L, 336D LN, 336D2, 336E LH, 336E LN
2969391
TUBE AS
330D L, 330D LN
330D L, 330D LN
2889853
TUBE AS
330D L
330D L
3229900
TUBE AS
330D L, 330D LN
330D L, 330D LN
3032902
TUBE AS
330D L, 330D LN
330D L, 330D LN
3032903
TUBE AS
330D L, 330D LN
330D L, 330D LN
3079857
TUBE AS
330D L, 330D LN
330D L, 330D LN
3079858
TUBE AS
330D L, 330D LN
330D L, 330D LN
3079888
TUBE AS
330D L, 330D LN
330D L, 330D LN
2969389
TUBE AS
330D L, 330D LN
330D L, 330D LN
2952211
TUBE AS
330D L, 330D LN, 336D L
330D L, 330D LN, 336D L
2952210
TUBE AS
330D L, 330D LN, 336D L
330D L, 330D LN, 336D L
2958156
TUBE AS
330D L, 330D LN, 336D L
330D L, 330D LN, 336D L
3231617
TUBE AS
330D L, 330D LN, 336D L
330D L, 330D LN, 336D L
3032905
TUBE AS
330D L, 330D LN
330D L, 330D LN