427f2 Side Shift Backhoe Loader Hwk00001-Up (Machine) Powered b

8/17/2019 427f2 Side Shift Backhoe Loader Hwk00001-Up (Machine) Powered b

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Bienvenido: r095gcr Producto: BACKHOE LOADERModelo: 427F2 BACKHOE LOADER HWKConfiguración: 427F2 Side Shift Backhoe Loader HWK00001-UP (MACHINE)POWERED BY C3.4 Engine

Operación de Sistemas422F2, 427F2, 428F2, 432F2 and 434F2 Backhoe Loaders Transmission (Standard Shift)Número de medio -UENR3742-00 Fecha de publicación -01/01/2015 Fecha de actualización -08/01/2015

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Transmission (Two-Wheel Drive)

SMCS - 3060



Illustration 1 g03723304

Transmission

(1) Input shaft assembly (shown with a dust cover over the input shaft)(2) Reverse idler input gear

(3) Reverse clutch pack

(4) Forward drive gear(5) Forward clutch pack

(6) Forward input gear

(7) Reverse idler shaft(8) Countershaft

(9) All Wheel Drive input gear (this gear does not mesh with anything on the two-wheel drive machines)

(10) First speed gear(11) First speed and second speed synchronizer assembly

(12) Second speed gear

(13) Third speed gear(14) Third speed and fourth speed synchronizer assembly

(15) Fourth speed gear(16) Output shaft

(17) Reverse input gear




Transmission(1) Input shaft assembly

(2) Reverse idler input gear(3) Reverse clutch pack(4) Forward drive gear

(5) Forward clutch pack

(6) Forward input gear(7) Reverse idler shaft

(8) Countershaft(9) All Wheel Drive input gear (this gear does not mesh with anything on the two-wheel drive machines)

(10) First speed gear

(11) First speed and second speed synchronizer assembly(12) Second speed gear

(13) Third speed gear

(14) Third speed and fourth speed synchronizer assembly(15) Fourth speed gear

(16) Output shaft

(17) Reverse input gear(18) Drive gear on countershaft (meshes with fourth speed gear)

The transmission has the following features:

• manual four-speed

• direct drive helical gear

• constant mesh



• synchronized arrangement

• coupled with hydraulically shifted forward and reverse shuttle clutches

The shuttle is a multi-disc clutch arrangement. The shuttle contains two clutch packs. One clutch pack on the

input shaft for Forward, and another clutch pack on an idler shaft for Reverse. Each clutch pack contains ten

plates and ten discs. The clutches are hydraulically engaged. The clutches are released by spring force.

Clutch engagement is accomplished by using an electrical harness that is connected to the solenoid control

valve and the direction selector valve. These valves hydraulically engage forward clutch (5) or reverse clutch

(3).

Input shaft assembly (1) sends the power from the torque converter turbine to the forward shuttle clutch. The

input shaft assembly rotates the same direction as the flywheel. Forward drive gear (4) is fixed to shaft (1)

and rotates the same direction as the flywheel. Therefore, the forward shuttle clutch plates also rotate the

same direction at the same speed as the input shaft.

Reverse idler gear (2) is fixed to reverse idler shaft (7). Gear (2) is meshed with gear (4). Therefore, gear (2)

and reverse clutch (3) turn opposite from the input shaft and the torque converter.

The input shaft assembly provides five internal oil passages. Three internal oil passages are for lubrication of

the clutches. The remaining two internal oil passages are for the engagement of the forward clutch pack or

the reverse clutch pack.

Forward input gear (6) and Reverse input gear (17) are free to rotate on their respective shaft assembly when

both forward and reverse clutch packs are not engaged. The discs rotate with the input gears.

Reverse shaft (7) provides reverse rotation to countershaft (8) when Reverse clutch (3) is engaged. The

power flows from forward drive gear (4), to reverse idler gear (2), driving reverse input gear (17) when the

reverse clutch pack is engaged.

Countershaft (8) transfers power to the speed range gears on output shaft (16). Drive gear (18) on the

countershaft increases roading in fourth gear to approximately 40 km/h (25 mph). The power is transferredfrom the forward input gear (6) or from the reverse idler input gear (17). The gear that is used depends on

the clutch pack that is engaged.

Output shaft (16) carries speed range gears (10), (12), (13), and (15) and synchronizer assemblies (11) and

(14). All of the speed range gears rotate on caged roller bearings on the output shaft.




Synchronizer assembly exploded view

(16) Output shaft(19) Cup

(20) Shifter fork

(21) Sliding collar(22) Cone

(23) Split pin

(24) Blocker pin

The synchronizer assembly consists of two inner synchronizer cones (22). The cones are mounted to sliding

collar (21) by a series of alternating alignment blocker pins (24) and the spring loaded split pins (23). The

inner diameter of sliding collar (21) is splined to output shaft (16). The speed range gears have matching

splines. Synchronizer cups (19) are splined to the speed range gears and the cups rotate with the speed range

gears.

When shift fork (20) moves sliding collar (21) to engage a speed gear, the sliding collar comes in contact

with the shoulder of the blocker pins (24). The force that is exerted on the blocker pins causes the blocker

pin to push the cone against the cup. The assembly of sliding collar (21) and the output shaft (16) are

rotating at the same speed as the speed gear. This results in synchronization.

If there is a torsional load or mismatch of speeds between the speed range gear and the output shaft, the

shoulder of the blocker pin will prevent the sliding collar from engaging. When the speeds are synchronized

and there is no torsional load or side load on the blocker pin, the sliding collar will continue to slide as the

shifter fork moves.

Split pins (23) will collapse and the pin will act as a locking mechanism in order to keep sliding collar (21)

engaged with output shaft (16).

The four speed shift lever is on the floor. The operator neutralizes the solenoid control valve of the

transmission by depressing the neutralizer button on the shift lever and holding the button. This shifts the

speed range gears. Activating the neutralizer button releases a direction clutch and the button places the



transmission into NEUTRAL position. Now, the operator can select any speed range gear, even when the

vehicle is moving. Once the shift is complete, the neutralizer button must be released. The speed shift is

completed and the direction clutch is engaged again. Power is sent from the output shaft to the rear axle.

Only one synchronizer assembly can be engaged at a time.

Illustrations 1 and 2 show the actual orientation of the transmission shafts. In the following

explanations, the shafts are shown in a straight line for clarity of power flow. The forward clutch andreverse clutch may be moved in the illustration to better show gear contact for direction.

Power Flow (First Speed Forward Or Second Speed Forward)




Power flow in first speed forward(1) Input shaft assembly

(2) Reverse idler input gear

(3) Reverse clutch pack(4) Forward drive gear

(5) Forward clutch pack(6) Forward input gear

(7) Reverse idler shaft


(10) First speed gear



(14) Third speed and fourth speed synchronizer assembly(15) Fourth speed gear

(16) Output shaft

(17) Reverse input gear(18) Drive gear on countershaft (meshes with fourth speed gear (15))

(25) Driven gear on countershaft that is driven by the forward or reverse input gear. This gear also meshes with third speed gear(13).

(26) Drive gear on countershaft meshed with second speed gear (12)

(27) Drive gear on countershaft meshed with first speed gear (10)




Power flow in second speed forward(1) Input shaft assembly





(8) Countershaft

(9) All Wheel Drive input gear (this gear does not mesh with anything on the two-wheel drive machines)(10) First speed gear



(14) Third speed and fourth speed synchronizer assembly





(18) Drive gear on countershaft (meshes with fourth speed gear)(25) Driven gear on countershaft driven by forward or reverse input gear. This gear also meshes with third speed gear (13).

(26) Drive gear on countershaft meshed with second speed gear (12)(27) Drive gear on countershaft meshed with first speed gear (10)


Synchronizer assembly(19) Cup

(20) Shifter fork


(23) Split pin

(24) Blocker pin

The torque converter turbine drives input shaft assembly (1). The operator moves the direction control lever

that is mounted on the steering wheel column to the forward position engaging the forward clutch. The oil

pressure is sent through input shaft assembly (1) pressurizing the clutch piston in forward clutch pack (5).

Clutch (5) engages sending power to forward input gear (6).

Forward input gear (6) transmits the power to drive gear (25), which turns countershaft (8), which is

constantly engaged with the speed range gears. The neutralizer button that is located on the shift lever must

be activated in order to neutralize the solenoid control valve of the transmission. This engages first speed

gear (10) or second speed gear (12) with output shaft (16). Activating the neutralizer button releases a

direction clutch and the button places the transmission into NEUTRAL. The shift lever can now be moved

into first gear or second gear. Shifter fork (20) slides synchronizer collar (21) to the right so first speed gear

(10) engages with output shaft (16). Also, the shifter fork (20) can slide the synchronized collar (21) to the

left so second speed gear (12) engages with output shaft (16).



If there is no torsional load or mismatch of speeds between the speed gear and the output shaft, synchronizer

assembly (11) will engage the speed gear with the output shaft. Once the shift is complete, the neutralizer

button must be released. The speed shift is completed and the direction clutch is engaged again. Power is

sent from the output shaft to the rear axle.

Power Flow (Third Speed Forward Or Fourth Speed Forward)


Power flow in third speed forward

(1) Input shaft assembly

(2) Reverse idler input gear(3) Reverse clutch pack

(4) Forward drive gear









(15) Fourth speed gear

(16) Output shaft(17) Reverse input gear

(18) Drive gear on countershaft (meshes with fourth speed gear)

(25) Driven gear on countershaft driven by forward or reverse input gear. This gear also meshes with third speed gear (13).(26) Drive gear on countershaft meshed with second speed gear (12)





Power flow in fourth speed forward(1) Input shaft assembly





(8) Countershaft

(9) All Wheel Drive input gear (this gear does not mesh with anything on the two-wheel drive machines)(10) First speed gear











Synchronizer assembly(19) Cup

(20) Shifter fork


(23) Split pin

(24) Blocker pin

The torque converter turbine drives input shaft assembly (1). The operator moves the direction control lever

that is mounted on the steering wheel column to the forward position engaging the forward clutch. The oil

pressure is sent through input shaft assembly (1) pressurizing the clutch piston in forward clutch pack (5).

Clutch (5) engages sending power to forward input gear (6).

Forward input gear (6) transmits the power to drive gear (25), which turns countershaft (8), which is

constantly engaged with the speed range gears. Gear (25) turns third speed gear (13). The neutralizer button

that is located on the shift lever must be activated in order to neutralize the solenoid control valve of the

transmission. This engages third speed gear (13) or fourth speed gear (15) with output shaft (16). Activating

the neutralizer button releases a direction clutch and the button places the transmission into NEUTRAL. The

shift lever can now be moved into third gear or fourth gear. Shifter fork (20) slides synchronizer collar (21)

to the right so third speed gear (13) engages with output shaft (16). Also, shifter fork (24) can slide the

synchronized collar (21) to the left so fourth speed gear (15) engages with output shaft (16).



Power Flow (First Speed Reverse Or Second Speed Reverse)


Power flow in first speed reverse(1) Input shaft assembly









(12) Second speed gear(13) Third speed gear



(17) Reverse input gear(18) Drive gear on countershaft (meshes with fourth speed gear)

(25) Driven gear on countershaft driven by forward or reverse input gear. This gear also meshes with third speed gear (13).



Power flow in second speed reverse

(1) Input shaft assembly


(4) Forward drive gear(5) Forward clutch pack(6) Forward input gear













Illustration 12 g03727422Synchronizer assembly

(19) Cup(20) Shifter fork

(21) Sliding collar

(22) Cone(23) Split pin

(24) Blocker pin

The torque converter turbine drives input shaft assembly (1). Forward drive gear (4) is fixed to shaft (1) and

gear (4) is constantly engaged with reverse idler gear (2). Gear (2) is fixed to reverse idler shaft (7).

Therefore, gear (4) turns gear (2), rotating shaft (7) in opposite direction of the torque converter.

The operator moves the direction control lever that is mounted on the steering wheel column to the reverse position engaging the reverse clutch. The oil pressure is sent through reverse shaft assembly (7) pressurizing

the reverse clutch piston. Reverse clutch pack (3) engages transmitting power to reverse input gear (17).

Reverse input gear (17) is meshed to gear (25) on countershaft (8). Gear (17) turns gear (25) turning

countershaft (8).

The countershaft is in constant mesh with speed range gears that are mounted on output shaft (16). The

neutralizer button that is located on the shift lever must be activated in order to neutralize the solenoid

control valve of the transmission. This engages first speed gear (10) or second speed gear (12) with output



shaft (16). Activating the neutralizer button releases a direction clutch and the button places the transmission

into NEUTRAL. The shift lever can now be moved into first gear or second gear. Shifter fork (20) slides

synchronizer collar (21) to the right so first speed gear (10) engages with output shaft (16). Also, the shifter

fork (20) can slide the synchronized collar to the left so second speed gear (12) engages with output shaft

(16).


assembly (11) will engage the speed gear with the output shaft. Once the shift is complete, the neutralizer button must be released. The speed shift is completed and the direction clutch is engaged again. Power is


Power Flow (Third Speed Reverse Or Fourth Speed Reverse)


Power flow in third speed reverse

(1) Input shaft assembly(2) Reverse idler input gear

(3) Reverse clutch pack

(4) Forward drive gear(5) Forward clutch pack

(6) Forward input gear











(26) Drive gear on countershaft meshed with second speed gear (12)



Power flow in fourth speed reverse(1) Input shaft assembly
















Illustration 15 g03727424Synchronizer assembly

(19) Cup(20) Shifter fork

(21) Sliding collar

(22) Cone(23) Split pin

(24) Blocker pin



The torque converter turbine drives input shaft assembly (1). Forward drive gear (4) is fixed to shaft (1) and

gear (4) is constantly engaged with reverse idler gear (2). Gear (2) is fixed to reverse idler shaft (7).

Therefore, gear (4) turns gear (2), rotating shaft (7) in opposite direction of the torque converter.

The operator moves the direction control lever that is mounted on the steering wheel column to the reverse

position engaging the reverse clutch. The oil pressure is sent through reverse shaft assembly (7) pressurizing

the reverse clutch piston. Reverse clutch pack (3) engages transmitting power to reverse input gear (17).

Reverse input gear (17) is meshed to gear (25) on countershaft (8). Gear (17) turns gear (25) turning

countershaft (8).

The countershaft is in constant mesh with speed range gears that are mounted on output shaft (16). The

neutralizer button that is located on the shift lever must be activated in order to neutralize the solenoid

control valve of the transmission. This engages third speed gear (13) or fourth speed gear (15) with output

shaft (16). Activating the neutralizer button releases a direction clutch and the button places the transmission

into NEUTRAL. The shift lever can now be moved into first gear or second gear. Shifter fork (20) slides

synchronizer collar (21) to the right so third speed gear (13) engages with output shaft (16). Also, shifter

fork (20) can slide the synchronized collar to the left so fourth speed gear (15) engages with output shaft

(16).


assembly (14) will engage the speed gear with the output shaft. Once the shift is complete, the neutralizer

button must be released. The speed shift is completed and the direction clutch is engaged again. Power is


Copyright 1993 - 2016 Caterpillar Inc.Todos los derechos reservados.Red privada para licenciados del SIS.

Wed Apr 27 2016 15:08:40 GMT-0500 (Hora est. Pacífico, Sudamérica)

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427f2 Side Shift Backhoe Loader Hwk00001-Up (Machine) Powered b