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G50 and G55 Manual Transmissions: Description

The document discusses the G50 and G55 manual transmissions used in the new Hilux. The G50 transmission is used with the 2KD-FTV 2WD engine, while the G55 is used with the 1TR-FE 2WD engine. Both transmissions have been improved with a reverse synchromesh mechanism to enhance ease of shifting into reverse. The mechanism uses two shifting keys, springs, and a hub sleeve to reduce shift effort when changing into fifth gear or to prevent noise when changing into reverse.

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Carlos Machado
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2K views7 pages

G50 and G55 Manual Transmissions: Description

The document discusses the G50 and G55 manual transmissions used in the new Hilux. The G50 transmission is used with the 2KD-FTV 2WD engine, while the G55 is used with the 1TR-FE 2WD engine. Both transmissions have been improved with a reverse synchromesh mechanism to enhance ease of shifting into reverse. The mechanism uses two shifting keys, springs, and a hub sleeve to reduce shift effort when changing into fifth gear or to prevent noise when changing into reverse.

Uploaded by

Carlos Machado
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOC, PDF, TXT or read online on Scribd
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CH-4 CHASSIS – G50 AND G55 MANUAL TRANSMISSIONS

G50 AND G55 MANUAL TRANSMISSIONS

 DESCRIPTION

 The new Hilux has been adopted the G50 and G55 manual transmissions. The application for these
manual transmissions are as followings:

Engine Type Drive Type Transmission


2KD-FTV 2WD G50
1TR-FE 2WD G55

 A reverse synchromesh mechanism has been adopted for the reverse gear of these manual transmissions to
enhance the ease of operation.

Reverse Synchormesh
Mechanism

271CH04

G50
CH-5 CHASSIS – G50 AND G55 MANUAL TRANSMISSIONS
CHASSIS- G50 AND G55 MANUAL TRANSMISSIONS CH-6

Specifications

Transmission Type G50 G55


Engine Type 2KD-FTV 1TR-FE
1st 3.928 4.452
2nd 2.333 2.619
3rd 1.451 1.517
Gear Ratio
4th 1.000 
5th 0.798 0.854
Reverse 4.743 4.472
Oil Capacity Liters (US qts, Imp.qts) 2.2 (2.3, 1.9) 
Oil Viscosity SAE 75W-90 
Oil Grade API GL-4 or GL-5 
Weight (Reference)* kg (lb) 41.3 (91.1) 

*: Weight shows the figure with the oil fully filled.

 Synchromesh Mechanism Specifications

Transmission Type G50 G55

Engine Type 2KD-FTV 1TR-FE


1st Single Cone 
2nd Single Cone 
3rd Single Cone 
4th Single Cone 
5th Single Cone 
Reverse Single Cone 
CH-7 CHASSIS – G50 AND G55 MANUAL TRANSMISSIONS

 REVERSE SYNCHROMESH MECHANISM

1. General

The reverse synchromesh mechanism consists of 2 shifting keys, shifting key spring, and shifting key
return spring.

Counter 5th Gear Hub Sleeve


Shifting Key

Snap Ring

Shifting Key
Return Spring

Shifting Key Spring

Hub Sleeve

Shifting Key
Shifting Key

Shifting Key Return Spring

Snap Ring
Counter 5th Gear

Shifting Key Spring

Shifting Key
233CH05
CHASSIS- G50 AND G55 MANUAL TRANSMISSIONS CH-8
CH-9 CHASSIS – G50 AND G55 MANUAL TRANSMISSIONS

2. Operation

 While shifting into 5th, the 2 shifting keys move in unison with the hub sleeve (F1). With "A" acting as
the fulcrum, the 2 shifting keys move to push the synchronizer ring only for the amount of the lever ratio
(F2). The shift effort can be reduced only for this amount.

Hub Sleeve Moving Direction


Hub Sleeve
Shifting Key

F1
F2

Synchronizer
Shifting Key Ring

Shifting Key A
233CH02
233CH01

 While shifting into reverse, with "B" acting as the fulcrum, the 2 shifting keys move to push the
synchronizer ring (F2). As a result, a brake is applied to the rotation of the counter shaft and gear noise is
prevented.

Hub Sleeve Hub Sleeve Moving Direction

Shifting Key
F1

B Synchronizer
Ring
Shifting Key

F2
Shifting Key
233CH03 233CH04
CHASSIS- G50 AND G55 MANUAL TRANSMISSIONS CH-10

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