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420E 420E Backh Backhoe oe Load Loader er Sing Single le Tilt Tilt Cent Center er Pivo Pivott HLS00 HLS00001 001-UP -UP (MACHI (MACHINE) NE) POWERE POWERED D BY 3054 3054C C Engine Engine(SE (SEBP3 BP3703 703 - 77) - Docum Document entati ation on

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Welcome: r464ofe Product: BACKHOE LOADER Model: 420E BACKHOE LOADER HLS Configuration: 420E Backhoe Loader Single Tilt Center Pivot HLS00001-UP (MACHINE) POWERED BY 3054C Engine

Systems Operation 420E, 430E, 432E, 434E, 442E and 444E Backhoe Loaders Transmission (Power (Power Shift) Media Number -RENR6473-02

Publication Date -01/07/2007

Date Updated -13/07/2007

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Transmission Control SMCS - 3065; 3150

Illustration 1 (1) Solenoid for clutch 2 (2) Solenoid for clutch 3 (3) Reverse solenoid (4) Forward low solenoid (5) Forward high solenoid

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420E Backhoe Loader Single Tilt Center Pivot HLS00001-UP (MACHINE) POWERED BY 3054C Engine(SEBP3703 - 77) - Documentation

Illustration 2

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(6) All wheel drive solenoid (7) Solenoid for clutch 1

The solenoid control valves for the transmission are installed on the top and on the right side of the transmission housing. The solenoid control valves for the transmission control the FORWARD, REVERSE, FIRST, SECOND, THI RD, and NEUTRAL functions of the transmission. The solenoid control valves direct the pressurized oil to either the forward clutch packs or to the reverse clutch packs. In the NEUTRAL position, clutch pressure is dumped back to the transmission case. The reverse solenoid of the solenoid control valve for the transmission is electrically connected with the backup alarm switch. The backup alarm switch activates the backup alarm.

Illustration 3

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Neutralizer switch

Illustration 4 Neutralizer button (If equipped)

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Illustration 5

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Neutralizer control (If equipped)

The neutralizer switch is located on either the left side of the dash or the loader control lever. The neutral lock switch on the left side of the dash disable all transmission solenoids. The neutralizer switch that is located on the loader control lever disengages the solenoids for direction control. If the machine is turned off, and the direction control lever is left in the FORWARD position or the REVERSE position, the machine will not be able to start until the direction control lever is returned to the NEUTRAL position. The neutralizer switch that is located on the loader control lever also is a downshift control when the autoshift function is selected. If the neutralizer switch is pressed and released within 0.5 seconds, the transmission will downshift to the next lower speed. The transmission can be downshifted multiple speeds if the button is pressed quickly multiple times. Note: The transmission will downshift only if a engine overspeed will not occur.

Illustration 6

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Direction control lever

The solenoids that are located in the solenoid control valves are actuated by electricity. The solenoids are actuated by the direction control lever that is on the steering wheel column. When the solenoid control valve is de-energized, the springs center the spool, which blocks the oil flow from the transmission pump. The oil pressure in the direction clutch decreases and the direction clutch disengages when oil flow to the transmission is blocked. When the transmission solenoid is energized, the oil passages to the transmission are opened. The energized solenoid permits the fill ing of the direction clutches. The energized solenoids also allow the pressure to build up in the transmission.

All Wheel Drive

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Illustration 7 All wheel drive in NEUTRAL (1) Oil pump (2) Pump pressure tap (3) Oil filter with bypass (4) Autoshift electronic control module (5) All wheel drive clutch (6) Clutch 2 (7) Clutch 3 (8) Reverse clutch (9) Forward high clutch (10) Forward low clutch (11) Clutch 1 (12) System relief valve (13) Torque converter inlet relief valve (14) Torque converter (15) Temperature sensor for the torque converter outlet (16) Oil cooler bypass valve (17) Test port for the lubrication pressure (18) Suction screen

The all wheel drive attachment will improve mobility and overall performance of the loader in conditions of poor traction.

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The front drive axle may be engaged at any time by activating the all wheel drive switch on the left side of the front console. This switch may be activated when the vehicle is stopped or while the vehicle is moving. The front drive axle may also be engaged by placing the all wheel drive switch in the position for all wheel drive braking and depressing the brake pedal.

Illustration 8

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All wheel drive switch

The following components are required with the all wheel drive attachment: all wheel drive switch, all wheel drive solenoid valve, transmission for the all wheel drive, clutch pack for the all wheel drive that is on the output shaft for the all wheel drive, a steerable front drive axle and front drive shaft with a guard. The front drive shaft connects the output shaft for the all wheel drive with the steerable front drive axle. When the engine is running, oil pump (1) pulls oil from the reservoir through suction screen (18) to the pump. The oil pump sends the oil through filter (3) and to the control solenoid valve for the transmission. With the direction control lever in the NEUTRAL position, oil flow is blocked by the solenoid control valve. This allows oil that is not needed by the transmission circuit to flow through the system relief valve to the torque converter. With the all wheel drive switch in the OFF position, oil flows to the clutch pack for all wheel drive (5) . The oil is then blocked by the all wheel drive solenoid valve. With the all wheel drive switch in the ON position, oil flows to the all wheel drive solenoid. With an energized all wheel drive solenoid, a passage will open in order to provide an oil passage to the clutch pack (5) . With the all wheel drive switch in the ALL WHEEL DRIVE BRAKING position, oil flows to the clutch pack for all wheel drive (5) . The oil is then blocked by the all wheel drive solenoid valve until both brake pedals are engaged. When both brake pedals are engaged the all wheel drive solenoid will energize. With an energized all wheel drive solenoid, a passage will open in order to provide an oil passage to the clutch pack (5) .

Run The Engine (Forward First Speed Gear)

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Illustration 9

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(1) Oil pump (2) Pump pressure tap (3) Oil filter with bypass (4) Autoshift electronic control module (5) All wheel drive clutch (6) Clutch 2 (7) Clutch 3 (8) Reverse clutch (9) Forward high clutch (10) Forward low clutch (11) Clutch 1 (12) System relief valve (13) Torque converter inlet relief valve (14) Torque converter (15) Temperature sensor for the torque converter outlet (16) Oil cooler bypass valve (17) Test port for the lubrication pressure (18) Suction screen

When the direction control lever on the steering wheel column is moved to the FORWARD position, the forward low solenoid of the solenoid valve is electrically activated. The electrical activation of the forward solenoid overrides the centering spring. The spool will then move. Pressurized oil will be able to flow to the forward low direction clutch (10) .

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When the engine is running, oil pump (1) pulls oil from the reservoir through suction screen (18) to the pump. The oil pump sends the oil through filter (3) and to the control solenoid valve for the transmission. An orifice within the control solenoid valve establishes a constant flow and pressure of oil to the direction clutches. This allows oil that is not needed by the transmission circuit to flow to the torque converter. The FORWARD position and the first speed gear directs oil to the forward low clutch pack (10) . The oil is then directed to the clutch pack (11) for clutch 1. Oil fills the clutch pack for clutch 1. When the clutch pack obtains system operating pressure, the pressure regulator valve opens. The pressure regulator valve helps maintain system operating pressure to the clutch packs. When the pressure regulator valve is closed, an orifice within the relief valve still permits the flow of oil to the torque converter at low idle for lubrication and cooling purposes. Torque converter inlet relief valve (13) controls maximum pressure to the torque converter in order to prevent damage during cold starts. Torque converter pressure is maintained in the torque converter by the restrictions that are created by the oil cooler and the oil lines that are leaving the torque converter. When the switch for the all wheel drive is in the ON position, oil will flow through a small passage to the solenoid valve for the all wheel drive. When the all wheel drive solenoid is energized, a passage opens to a tube. The tube provides an oil passage that leads to the clutch pack for all wheel drive (5) .

Run The Engine (Reverse First Speed Gear)

Illustration 10 (1) Oil pump (2) Pump pressure tap (3) Oil filter with bypass (4) Autoshift electronic control module (5) All wheel drive clutch

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(7) Clutch 3 (8) Reverse clutch (9) Forward high clutch (10) Forward low clutch (11) Clutch 1 (12) System relief valve (13) Torque converter inlet relief valve (14) Torque converter (15) Temperature sensor for the torque converter outlet (16) Oil cooler bypass valve (17) Test port for the lubrication pressure (18) Suction screen

When the direction control lever on the steering wheel column is moved to the REVERSE position, the reverse solenoid of the solenoid valve is electrically activated. The electrical activation of the reverse solenoid overrides the centering spring. The spool will then move. Pressurized oil will be able to flow to the reverse direction clutch (8) . When the engine is running, oil pump (1) pulls oil from the reservoir through suction screen (18) to the pump. The oil pump sends the oil through filter (3) and to the control solenoid valve for the transmission. An orifice within the control solenoid valve establishes a constant flow and pressure of oil to the direction clutches. This allows oil that is not needed by the transmission circuit to flow to the torque converter. The REVERSE position and the first speed gear directs oil to the reverse clutch pack (8) . The oil is then directed to the clutch pack (11) for clutch 1. Oil fills the clutch pack for clutch 1. When the clutch pack obtains system operating pressure, the pressure regulator valve opens. The pressure regulator valve helps maintain system operating pressure to the clutch packs. When the pressure regulator valve is closed, an orifice within the relief valve still permits the flow of oil to the torque converter at low idle for lubrication and cooling purposes. Torque converter inlet relief valve (13) controls maximum pressure to the torque converter in order to prevent damage during cold starts. Torque converter pressure is maintained in the torque converter by the restrictions that are created by the oil cooler and the oil lines that are leaving the torque converter. When the switch for the all wheel drive is in the ON position, oil will flow through a small passage to the solenoid valve for the all wheel drive. When the all wheel drive solenoid is energized, a passage opens to a tube. The tube provides an oil passage that leads to the clutch pack for all wheel drive (5) . Copyright 1993 - 2018 Caterpillar Inc. All Rights Reserved. Private Network For SIS Licensees.

Wed May 09 2018 19:57:04 GMT-0500 (Hora est. Pacífico, Sudamérica) r464ofe

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