TH220B, TH330B, TH340B, TH350B, TH355B, TH360B, TH460B, TH560B and TH580B Telehandlers Power Train Caterpillar


Transmission Power Flow

Usage:

TH355B JRK



Illustration 1g01007675

(1) Input shaft

(2) Gear

(3) Gear

(4) Fan drive shaft

(5) Gear

(6) Pump drive shaft

(7) Input drive gear

(8) Forward/Reverse shaft

(9) Forward primary gear

(10) Reverse primary gear

(11) Gear

(12) Reverse idler shaft

(13) Gear

(14) Fourth gear (countershaft)

(15) Countershaft

(16) First gear (countershaft)

(17) Second gear (countershaft)

(18) Third gear (countershaft)

(19) Fifth gear (countershaft)

(20) First gear (output shaft)

(21) Second gear (output shaft)

(22) Third gear (output shaft)

(23) Fourth gear (output shaft)

(24) Fifth gear (output shaft)

(25) Output shaft

(F) Forward clutch

(R) Reverse clutch

(X) Synchronizer for the first speed and second speed

(Y) Synchronizer for the third speed and fourth speed

(Z) Synchronizer for the fifth speed

Table 1 and Table 2 show the engagements of the clutches and the synchronizers for different speed selections.

Table 1
FORWARD DIRECTION    
Selected Speed     Engaged Clutches and Synchronizers    
Neutral     None    
First Speed Forward     Forward clutch (F) and synchronizer (X) with first gear (20)    
Second Speed Forward     Forward clutch (F) and synchronizer (X) with second gear (21)    
Third Speed Forward     Forward clutch (F) and synchronizer (Y) with third gear (22)    
Fourth Speed Forward (1)     Forward clutch (F) and synchronizer (Y) with fourth gear (23)    
Fifth Speed Forward (if equipped) (1)     Forward clutch (F) and synchronizer (Z) with fifth gear (19)    
( 1 ) Forward direction only

Table 2
REVERSE DIRECTION    
Selected Speed     Engaged Clutches and Synchronizers    
Neutral     None    
First Speed Reverse     Reverse clutch (R) and synchronizer (X) with first gear (20)    
Second Speed Reverse     Reverse clutch (R) and synchronizer (X) with second gear (21)    
Third Speed Reverse     Reverse clutch (R) and synchronizer (Y) with third gear (22)    
Fourth Speed Reverse (Power Shuttle Transmission )     Reverse clutch (R) and synchronizer (Y) with third gear (23)    

Examples of Power Flow Through the Transmission

First Speed Forward




Illustration 2g00886981

When first speed forward is selected, synchronizer (X) locks first gear (20) to output shaft (25). Also, forward clutch (F) is hydraulically actuated in order to lock forward primary gear (9) to forward/reverse shaft (8) .

Power will flow through components in the following order:

  • Input shaft (1)

  • Gear (2)

  • Gear (3)

  • Gear (5)

  • Input drive gear (7)

  • Forward/Reverse shaft (8)

  • Forward clutch (F)

  • Forward primary gear (9)

  • Fourth gear (countershaft) (14)

  • Countershaft (15)

  • First gear (countershaft) (16)

  • First gear (output shaft) (20)

  • Synchronizer (X)

  • Output shaft (25)

Second Speed Reverse




Illustration 3g00886984

When second speed reverse is selected, synchronizer (X) locks second gear (21) to output shaft (25). Also, reverse clutch (R) is hydraulically actuated in order to lock reverse primary gear (10) to forward/reverse shaft (8) .

Power will flow through components in the following order:

  • Input shaft (1)

  • Gear (2)

  • Gear (3)

  • Gear (5)

  • Input drive gear (7)

  • Forward/Reverse shaft (8)

  • Reverse clutch (R)

  • Reverse primary gear (10)

  • Gear (11)

  • Reverse idler shaft (12)

  • Gear (13)

  • Fourth gear (countershaft) (14)

  • Countershaft (15)

  • Second gear (countershaft) (17)

  • Second gear (output shaft) (21)

  • Synchronizer (X)

  • Output shaft (25)

Fifth Speed Forward (If Equipped)




Illustration 4g00886983

When fifth speed forward is selected, synchronizer (Z) locks fifth gear (19) to countershaft (15). Also, forward clutch (F) is hydraulically actuated in order to lock forward primary gear (9) to forward/reverse shaft (8) .

Power will flow through components in the following order:

  • Input shaft (1)

  • Gear (2)

  • Gear (3)

  • Gear (5)

  • Input drive gear (7)

  • Forward/Reverse shaft (8)

  • Forward clutch (F)

  • Forward primary gear (9)

  • Fourth gear (countershaft) (14)

  • Countershaft (15)

  • Synchronizer (Z)

  • Fifth gear (countershaft) (19)

  • Fifth gear (output shaft) (24)

  • Output shaft (25)

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