D 6 N T R A C K - T Y P E T R A C TO R

POWER TRAIN
FINGER TIP CONTROL (FTC)

© 2003 Caterpillar Inc.

 STEERING CLUTCHES
AND BRAKES (1)

PLANETARY POWER
SHIFT TRANSMISSION (4)

(3) DIESEL
FINAL DRIVES (2) ENGINE

(8) TRACKS

(5) (6) (7)

TRANSFER AND MAIN DRIVE TORQUE
BEVEL GEARS SHAFT CONVERTER

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 D5N/D6N TRACK-TYPE TRACTOR
COMPONENT IDENTIFICATION (FINGER TIP CONTROL)

POWER TRAIN (2) TORQUE CONVERTER

OIL COOLER (1)
(4) POWER TRAIN OIL PUMP
ENGINE (3)
(6) PRIORITY VALVE
IMPLEMENT PUMP (5)
(8) IMPLEMENT CONTROL VALVES
FINGER TIP CONTROL (7)
(9) CASE DRAIN FILTER
STEERING CLUTCH
(11) IMPLEMENT HYDRAULICS
AND BRAKE VALVE (10)
REMOTE TAPS
POWER TRAIN OIL FILL (14) POWER TRAIN
AND DIPSTICK (12) REMOTE TAPS
FINAL DRIVES (13) (16) HYDRAULIC TANK
STEERING CLUTCHES (17) HYDRAULIC OIL FILTER
AND BRAKES (15)
(19) BEVEL AND
POWER TRAIN TRANSFER GEARS
OIL FILTER (18)
(20) TRANSMISSION
TRANSMISSION
REMOTE TAPS (21) (22) TRANSMISSION HYDRAULIC CONTROL

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 CATERPILLAR D5N AND D6N FTC
MONITORING
FTC (2) PARKING SYSTEM (1) POWER TRAIN ELECTRONIC
BRAKE
CAT
CONTROL SYSTEM
SWITCH
DATA LINK POWER TRAIN
(3)
(4) ELECTRONIC
ECM CONTROL
(7) INPUTS/OUTPUTS
SERVICE
POWER TRAIN SERVICE TOOL (8) (5)
BRAKE
OIL FILTER
(6)
AND BYPASS (9)
PARKING BRAKE AND STEERING
SECONDARY BRAKE CLUTCH /
5 VALVES BRAKE (12)
PRIORITY (11)
VALVE (13)
1

(10) TORQUE CONVERTER

INLET RELIEF VALVE

2 STEERING CLUTCH
AND BRAKE
VALVES
4 (16) TRANSMISSION
3 MODULATING
STEERING CLUTCH VALVES STEERING
(15) MAIN RELIEF CLUTCH /
AND BRAKE LUBE (17)
VALVE BRAKE (12)
(18) TO TRANSMISSION LUBE
TORQUE CONVERTER AND
OUTLET RELIEF (19) BEVEL GEAR LUBE
VALVE (20)
TORQUE
BEVEL GEAR CONVERTER
CASE (21) (22)

POWER TRAIN
OIL COOLER (23)

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 D6N POWER TRAIN SCHEMATIC
FIRST GEAR FORWARD

TORQUE CONVERTER FLYWHEEL

LEFT CLUTCH LEFT BRAKE OUTLET RELIEF VALVE HOUSING
PRESSURE PORT (C1) PRESSURE PORT (20) (24)
(B1)
POWER TRAIN LUBE STEERING CLUTCH
OIL FILTER AND PRESSURE AND BRAKE VALVES (14)
BYPASS (9) PORT (LB1)

TORQUE CONVERTER
INLET RELIEF VALVE
(10)

(25) TORQUE
S•O•S SAMPLING ENGINE
CONVERTER
VALVE 4 (26)
(22)
TRANSMISSION 3 5
LUBE (18)

MAIN RELIEF
2 1
VALVE (15) PRIORITY
VALVE
(19) (13)
TRANSMISSION (27) BEVEL GEAR
(16) LUBE
TRANSMISSION
MODULATING VALVES
(23)
(21) POWER TRAIN
BEVEL GEAR POWER TRAIN OIL COOLER
CASE OIL PUMP (30)

(34)
RIGHT BRAKE TC SCAVENGE
PRESSURE PORT (B2) (LB2) LUBE (29)
PRESSURE PORT SCREEN AND (32) SCREEN
RIGHT CLUTCH MAGNET (31) TRANSMISSION/ (33)
PRESSURE PORT (C2) (28) FINAL DRIVE (MAIN SUMP) TORQUE CONVERTER STEERING/BRAKE TORQUE CONVERTER
AND LUBE SECTION CONTROLS SECTION SCAVENGE SECTION

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 PRIORITY VALVE
NORMAL MODE
TO SPOOL SOLENOID
ASSEMBLY VALVE (3)
CHECK INLET CHAMBER
VALVE HOLE PASSAGE (2)
(14) (4) (1)

(8) SLUG CHAMBER

(5) SPOOL ASSEMBLY

ADJUSTMENT
SCREW (10) SPOOL ASSEMBLY
CHAMBER
(6)

(7) SLUG

(8) SLUG CHAMBER

(11) FROM TC AND

PASSAGE TO TORQUE LUBE SECTION
CONVERTER AND POPPET (9) OF PUMP
LUBRICATION (12)

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 PRIORITY VALVE
PRIORITY MODE
SOLENOID
VALVE
PASSAGE TO CHECK INLET (3)
STEERING CLUTCH/ BRAKING/ VALVE PASSAGE HOLE
TRANSMISSION CONTROLS (13) (14) (1) (4)

POPPET
(9)

(5) SPOOL ASSEMBLY

ADJUSTMENT
SCREW (10)

(7) SLUG
LOCKNUT (15)
(8) SLUG CHAMBER
SPRING (16)

(11) FROM TC AND

DRAIN (17) LUBE SECTION
(12)
OF PUMP
PASSAGE TO TORQUE
CONVERTER AND
LUBRICATION

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 MAIN RELIEF VALVE
VALVE TRANSMISSION SLUG
ADJUSTMENT HYDRAULIC SPRING SPOOL CHAMBER SLUG
SCREW (3) CONTROL (1) (4) (5) (6) (7)

(12) (11) (10) (9) (8)

LOCKNUT DRAIN PASSAGE PASSAGE TO DRAIN
TO TRANSMISSION TRANSMISSION
LUBE MODULATING VALVES

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 TRANSMISSION MODULATING VALVE
TEST PORT (13) VALVE
BALL ORIFICE SPOOL SPRING
(14) (15) (16) (17)

PIN (19)
(18) (B) SUPPLY OIL
SOLENOID DRAIN (A) FROM PUMP
(20)
TO CLUTCH

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 POWER SHIFT TRANSMISSION
COMPONENTS
NO. 1 NO. 2 AND NO. 3 NO. 2 NO. 2 NO. 3 NO. 3 NO. 4 NO. 4 NO. 4
CLUTCH CARRIER CLUTCH RING GEAR CLUTCH RING GEAR CARRIER SUN GEAR CLUTCH NO. 4
(8) (9) (10) (11) (12) (13) (14) (15) (16) RING GEAR
(17)
NO. 5
CLUTCH
(18)

NO. 1
RING GEAR (7) (19) HUB
NO. 1
CARRIER (31)

A
(21) (20)
OUTPUT INPUT
SHAFT SHAFT
SPEED
SENSORS
NO. 1 SUN (32)
GEAR (30)

(22)
COUPLING HOUSING
GEAR (28) ASSEMBLY

VIEW A-A
(24) (23)
NO. 3 NO. 4
(29) (27) (26) (25) SUN GEAR PLANETARY GEARS
NO. 1 NO. 2 NO. 2 NO. 3
PLANETARY GEARS SUN GEAR PLANETARY GEARS PLANETARY GEARS

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 POWER SHIFT TRANSMISSION
FIRST SPEED FORWARD
NO. 2 AND NO. 3 NO. 2 NO. 2 NO. 3 NO. 3 NO. 4 NO. 4
CARRIER CLUTCH RING GEAR CLUTCH RING GEAR CARRIER SUN GEAR
(9) (10) (11) (12) (13) (14) (15)

(17) NO. 4 RING GEAR

(18) NO. 5 CLUTCH

1 2 3 4

(19) HUB

(21) (20)
OUTPUT INPUT
SHAFT SHAFT

(22) HOUSING
ASSEMBLY

(27) (26) (25) (24) (23)

NO. 2 NO. 2 NO. 3 NO. 3 NO. 4
SUN GEAR PLANETARY GEARS PLANETARY GEARS SUN GEAR PLANETARY GEARS

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 POWER SHIFT TRANSMISSION
FIRST SPEED REVERSE
NO. 2 AND NO. 3 NO. 2 NO. 2 NO. 3 NO. 3 NO. 4 NO. 4
CARRIER CLUTCH RING GEAR CLUTCH RING GEAR CARRIER SUN GEAR NO. 4 NO. 4
NO. 1 RING GEAR
(9) (10) (11) (12) (13) (14) (15) CLUTCH
CLUTCH (17)
(8) (16)

NO. 5
CLUTCH
(18)

NO. 1
RING GEAR (7) (19) HUB
1 2 3 4
NO. 1
CARRIER (31)

(21) (20)
OUTPUT INPUT
SHAFT SHAFT

(30) (22) HOUSING

NO. 1 ASSEMBLY
SUN GEAR

(29) (28) (27) (26) (25) (24) (23)

NO. 1 COUPLING NO. 2 NO. 2 NO. 3 NO. 3 NO. 4
PLANETARY GEAR SUN GEAR PLANETARY PLANETARY SUN GEAR PLANETARY
GEARS GEARS GEARS GEARS

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 POWER SHIFT TRANSMISSION
NEUTRAL
NO. 3 NO. 3
CLUTCH (12) RING GEAR (13)

1 2 3 4

(21) (20)
OUTPUT INPUT
SHAFT SHAFT

(29) NO. 1 PLANETARY (26) NO. 2 PLANETARY

GEARS GEARS

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 STEERING CLUTCH AND BRAKE CONTROL VALVE
ENGINE ON / PARKING BRAKE RELEASED
PARKING BRAKE PARKING/SECONDARY
SOLENOID VALVE (1) BRAKE VALVE (3)
AND SECONDARY BRAKE
CHECK PASSAGE
SOLENOID VALVE (2) (5)
VALVE
(4)
ACCUMULATOR
PISTON (6)

(7) REDUCING SPOOL

(8) PRESSURE FEEDBACK

CHAMBER

(9) ORIFICE

(10) SUPPLY CHAMBER

(11) PILOT PRESSURE CHAMBER

(12) (13) (17) TO CLUTCH/BRAKE

(14) (20) (21)
CLUTCH SOLENOIDS AND (22) (16)
DRAIN PASSAGE HOLE SPOOL DRAIN
BRAKE SOLENOIDS
(19)
PILOT VALVE (23) PILOT (18) SUPPLY OIL FROM PUMP
PRESSURE
CHAMBER (15) SHUTOFF VALVE

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 STEERING CLUTCH AND BRAKE CONTROL VALVE
GRADUAL RIGHT TURN

ACCUMULATOR
(13) CLUTCH
PISTON (6)
BRAKE SOLENOID
SOLENOIDS (12)

(12)
CLUTCH
SOLENOID

(24) TO
RIGHT
CLUTCH

(25) TO
RIGHT
BRAKE

(26) (27)
TO TO (1) (2)
LEFT LEFT (7) PARKING SECONDARY
CLUTCH BRAKE (18) BRAKE BRAKE
SUPPLY OIL REDUCING
SPOOL SOLENOID SOLENOID
FROM PUMP

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 STEERING CLUTCH AND BRAKE CONTROL VALVE
SHARP RIGHT TURN

ACCUMULATOR
(13) CLUTCH
PISTON (6)
BRAKE SOLENOID
SOLENOIDS (12)

(12)
CLUTCH
SOLENOID

(24) TO
RIGHT
CLUTCH

(25) TO
RIGHT
BRAKE

(26) (27)
TO TO (1) (2)
LEFT LEFT PARKING SECONDARY
(18) (7)
CLUTCH BRAKE BRAKE BRAKE
SUPPLY OIL REDUCING
SOLENOID SOLENOID
FROM PUMP SPOOL

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 STEERING CLUTCH AND BRAKE CONTROL VALVE
BRAKES ENGAGED

ACCUMULATOR
(13) CLUTCH
PISTON (6)
BRAKE SOLENOID
SOLENOIDS (12)

(12)
CLUTCH
SOLENOID

(24) TO
RIGHT
CLUTCH

(25) TO
RIGHT
BRAKE

(26) (27)
TO TO (1) (2)
LEFT LEFT PARKING SECONDARY
(18) (7) BRAKE
CLUTCH BRAKE BRAKE
SUPPLY OIL REDUCING SOLENOID
SOLENOID
FROM PUMP SPOOLS

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 Customized Color Palette
Black - Mechanical connection. Seal Red - High pressure oil

Dark Gray - Cutaway section Red/White Stripes - 1st pressure reduction

Light Gray - Surface color Red Crosshatch - 2nd reduction in pressure

White - Atmosphere OR Pink - 3rd reduction in pressure

Air (no pressure)

Purple - Pnuematic pressure Red/Pink Stripes - Secondary source oil pressure

Yellow - Moving or activated components Orange - Pilot, signal or Torque Converter oil

Cat Yellow - (restricted usage) Orange/White Stripes -

Identification of components Reduced pilot, signal or TC oil pressure
within a moving group
Orange Crosshatch - 2nd reduction in
Green - Tank, sump, or return oil pilot, signal or TC oil pressure.

Brown - Lubricating oil Blue - Trapped oil

Light Blue - Background color

(for slides only)

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