KENR9626
March 2011
Volume 1 of 2: Forestry Machine
568 Forestry Machine
Printed in U.S.A.© 2011 Caterpillar, All Rights Reserved
568 FM:
YJX1-UP
568 LL:
BRB1-UP
ONE POSITION TWO POSITION THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO - WAY THREE - WAY FOUR - WAY
SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION
(FIXED)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLE
INDICATES WIRE 135 IN HARNESS “AG”
325-PK-14
WIRE GAUGE
WIRE COLOR
CIRCUIT NUMBER
IDENTIFICATION
WIRE NUMBER IDENTIFICATION CODES
CURRENT STANDARD
PREVIOUS STANDARD
ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE
325-PK
WIRE COLOR
CIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR9626-00 VOL 1 of 2
36 Page, (Dimensions: 48 inches x 35 inches)
568 Log Loader
Hydraulic System
FF
EE
II
HH
DD
SOS
27
6
7
8
36
34
15
16
1413
9
35 172322
22432
25
3
4
26
37
12
31
11
33
GG
19
21
1
5
CCBBAA
18
20
10
28
31
32
PILOT LOCK
SWING BRAKE
TRAVEL SPEED
Tap
Number
Description
Schematic
Location
AA Drive Pump Delivery Pressure C-3
BB Power Shift Pressure B-3
CC Idle Pump Delivery Pressure B-3
DD Pilot Pump Delivery Pressure A-8
EE Drive Pump Negative Flow Pressure E-3
FF Idle Pump Negative Flow Pressure E-4
GG Boom Regeneration Pressure H-10
HH A1 Valve Retract Pressure I-10
II A1 Valve Extend Pressure I-11
SOS Fluid Sampling Port A-7
Tap Location
Pressure and Sampling
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot 164-6981 1 D-7
Block 168-9759 2 I-8
Control Gp - Joystick (LH) 335-0511 3 G-7
Control Gp - Joystick (RH) 335-0511 4 G-6
Core As - Oil Cooler 339-5904 5 F-8
Filter And Valve Gp - Pilot Supply 158-8987 6 A-8
Filter Gp - Hydraulic Oil (Case Drain) 289-8194 7 A-7
Filter Gp - Hydraulic Oil Return 188-4145 8 A-6
Manifold Gp - Control (Fan) 308-2638 9 B-3
Manifold Gp - Control (Selector) 232-4053 10 D-7
Manifold Gp And S
olenoid Gp - Control (Heav
y Lift / Boom Reg) 323-7895 11 H-9
Motor Gp - Swing 204-2679 12 C-3
Motor Gp - Travel (LH) 215-2443 13 G-4
Motor Gp - Travel (RH) 215-2443 14 G-3
Pump Gp - Main Hydraulic 349-4065 15 C-4
Sensor Gp - Pressure (Boom Cylinder Head End) 344-7392 16 I-10
Sensor Gp - Pressure (Boom Down) 344-7390 17 F-7
Sensor Gp - Pressure (Drive Pump Load Sense) 344-7390 18 E-5
Sensor Gp - Pressure (Drive Pump) 344-7392 19 A-1
1
Sens
or Gp - Pressure (Idle Pump Load Sense) 344-7390 20 E-4
Sensor Gp - Pressure (Idle Pump) 344-7392 21 A-10
Sensor Gp - Pressure (Swing) 344-7390 22 F-6
Switch As - Pressure (Pilot / Resolved) 319-4407 23 F-6
Switch As - Pressure (Pilot Travel (L)) 319-4407 24 H-6
Switch As - Pressure (Pilot Travel (R)) 319-4407 25 H-5
Swivel Gp 234-4440 26 F-4
Tank Gp - Hydraulic 348-1345 27 A-6
Valve Gp - Check 323-7502 28 F-9
Valve Gp - Load C
ontrol (Boom Drift Reduc
tion) 335-0200 29 C-13
Valve Gp - Load Control (Stick Drift Reduction) 335-0200 30 E-8
Valve Gp - Main Control (General Forestry W/ Attachment) 335-0382 F-12
Valve Gp - Main Control (General Forestry) 335-0241 F-12
Valve Gp - Pilot (Travel) 310-0107 32 H-5
Valve Gp - Pressure Reducing 285-1613 33 D-5
Valve Gp - Pump Control (Negative Flow) 310-0107 34 D-5
Valve Gp - Shuttle 323-7560 35 F-6
Valve Gp - S
olenoids
(General Forestry Atachment) 259-7430 36 I-11
Valve Gp - Swing Cushion 322-8716 37 D-3
Component Location - Volume 1 General Forestry
31
HYDRAULIC OIL COOLING
TRAVEL MOTORS / PILOT MANIFOLD
BOOM CIRCUIT
CAB AND RISER COMPARTMENT
SWIVEL / SWING / MAIN CONTROL
MAIN PUMP COMPARTMENT
KENR9626 VOL 1 of 2
36 Page, (Dimensions: 48 inches x 35 inches)
Components are shown installed on a fully operable machine with the key and engine off.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
VOLUME 1 of 2: FORESTRY MACHINE WITH ATTACHMENT SECTION
SCHEMATIC PART NUMBER: 345-3853 CHANGE: 00 VERSION: -
MEDIA NUMBER: KENR9626
THIS SCHEMATIC IS FOR THE 568 FORESTRY MACHINE HYDRAULIC SYSTEM
A
B
C
D
E
F
12345678
91011121314
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12345678
91011121314
A
B
C
D
E
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G
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LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
IDLE PUMP OUTPUT
DRIVE PUMP OUTPUT
MAIN PUMP POWER SHIFT CIRCUIT
SUPPLY LINE
ATTACHMENT CONTROL CIRUIT
STICK CYLINDER CONTOL CIRCUIT
LEFT TRAVEL MOTOR CONTROL CIRCUIT
SWING BRAKE CONTROL CIRCUIT
SWING CONTROL CIRCUIT
DRAIN / RETURN LINE
HEAVY LIFT CONTROL CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CYLINDER CONTROL CIRCUIT
RIGHT TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
FLEXXAIRE FAN CONTROL CIRCUIT
FF
EE
SOSDD
AA
BB
CC
HHII
GG
IN
OUT
T
PG
PC
Pi1
DR3
Pi2
DR6
P1
BOOM
BUCKET
STICK
SWING
JL1
IN R L
CLOSE
OPEN
DOWN
UP
T
B2
B1
A2
A1
P
PSA1
DR2
T-OUT1
T-OUT2
DR5
P2
P-IN
DR4
OIL COOLER
E
JLP
JLT
JRP
JRT
OUT
JL3
JL2
JL4
JR4
JR2
JR3
JR1
Pi1
Ps2
Pi2
D1
Ps1
B1
Dr1
Psv
a4
a1
a3
a2
a5
M1
M2
A4
D0
1
1
2
23
3
4
4
5
6
5
6
D
B
C
A
PAC
(EXT)
(RET)
(EXT)
(RET)
pST
BDr
dST
pST
L1
L2
pL1f
pL2b
L5
pL5f
BP2
pR5f
R5
pR1f
R1
pR2b
R2
BPi
SP2
BPi
pL4bpR5fpL5f
NFC2NFC1
pR3f
pR3f
pL3f
pL5b
pR4b
pR5b
SPi
SPi
P1
P2
P1
P2
pL3b
pL6f
pSR
pR6f
pR3b
pL3f
pL3b
R3
pBR
pR4b
R4
PL4b
L4
pSR
pR5b
pL5b
L6
A1
B1
P1
T
pR3b
pR6f
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3
B4
B5 B6 B7 B8C1
C2
C3 C4
NFC1
NFC2
pL7f
pR7f
OPT CYL
TRAVEL(L)
TRAVEL(R)
STR TRAVEL
BOOM(1)
BOOM(2)
SWING
STICK(2)
STICK(1)
(FWD)
(FWD)
(BKWD)
(BKWD)
(DOWN)
(UP)
(UP)
(R)
(L)
(OUT)
(OUT)
(IN)
(IN)
SDr
SP1
R6
ST
L3
BP1
BDr
BT
dR1b
drR
(CLOSE)
(OPEN)
BUCKET
T
BT3
ST6
TRAVEL(L)
TRAVEL(R)
FWD
BKWD
FWD
BKWD
pL1f
pR1f pR2b
pL2b
T
X
X
G
MA
MB
M
S
Bri
Bre
G
MA
MB
S
M
Bri
Bre
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
T
ABA B
R1 L1 L2 R2
PG
DB
M
A
B
SWING MOTOR
PB
PA
L4 R4
DE
A1
B1
BOOM CYLINDER
STICK CYLINDER
BUCKET CYLINDER
R5
L5
SP2
BP2
R3
L6
OPT CYL
2STC
CDF
SPBC
MU
SPBC
2STC
CDF
PiH
pR7f
pL7f
(BOOM
REGEN)
(HEAVY LIFT)
pBR
P1
P2
A1
A2
PiH
T
PUMP-S1
PUMP-S2
(BKWD)
(BKWD)
(FWD)
(FWD)
C
T
P
DR1
PSA2
DR1
T
T
P
T
1
5
2
4
6
3
MU
BDr
pL6f
(10) MANIFOLD GP - CONTROL
(SELECTER)
232-4053
(1)ACCUMULATOR GP - PILOT
164-6981
(21) SENSOR GP - PRESSURE
(IDLE PUMP)
344-7392
(19) SENSOR GP - PRESSURE
(DRIVE PUMP)
344-7392
(18) SENSOR GP -
PRESSURE
(DRIVE PUMP
LOAD SENSE)
344-7390
(20) SENSOR GP -
PRESSURE (IDLE
PUMP LOAD SENSE)
344-7390
(27) SWIVEL GP
234-4440
(6) FILTER AND VALVE GP - PILOT SUPPLY
158-8987
(7) FILTER GP - HYD OIL
(CASE DRAIN)
289-8194
(8) FILTER GP - HYD OIL RETURN
188-4145
(15) PUMP GP - MAIN HYD
349-4065
(36) VALVE GP - PUMP CONTROL
(NEGATIVE FLOW)
310-0107
(9) MANIFOLD GP -
CONTROL (FAN)
308-2638
(3) CONTROL GP -
JOYSTIC (LH)
335-0511
(4) CONTROL GP -
JOYSTIC (RH)
335-0511
(23) SWITCH AS -
PRESSURE
(PILOT / RESOLVED)
319-4407
(22) SENSOR GP -
PRESSURE
(SWING)
344-7390
(17) SENSOR GP -
PRESSURE
(BOOM DOWN)
344-7390
(34) VALVE GP - PILOT (TRAVEL)
310-0107
(25) SWITCH AS -
PRESSURE
(PILOT TRAVEL (R))
319-4407
(24) SWITCH AS -
PRESSURE
(PILOT TRAVEL (L))
319-4407
(14) MOTOR GP -
TRAVEL (RH)
215-2443
(13) MOTOR GP -
TRAVEL (LH)
215-2443
(16) SENSOR GP -
PRESSURE
(BOOM CYL HEAD END)
344-7392
(11) MANIFOLD GP AND SOL ENOID GP - CONTROL
(HEAVY LIFT / BOOM REGEN)
323-7895
(2) BLOCK
168-9759
(37) VALVE GP -
SHUTTLE
323-7560
(30) VALVE GP - CHECK
323-7502
(5) CORE AS - OIL COOLER
339-5904
(32) VALVE GP - LOAD CONTROL
(STICK DRIFT REDUCTION)
335-0200
(31) VALVE GP - LOAD CONTROL
(BOOM DRIFT REDUCTION)
335-0200
(35) VALVE GP -
PRESSURE
REDUCING
285-1613
(38) VALVE GP - SOLENOIDS
(GENERAL FORESTRY ATTCH)
259-7430
(33) VALVE GP - MAIN CONTROL
(GENERAL FORESTRY)
335-0241 (NO ATTCH SECTION)
335-0382 (WITH ATTCH SECTION)
(39) VALVE GP -
SWING
CUSHION
322-8716
(12) MOTOR GP - SWING
204-2679
(28) TANK GP - HYD OIL
348-1345
PILOT LOCK
SWING BRAKE
TRAVEL SPEED
POWER
SHIFT
FINE
SWING
TRAVEL
STRAIGHT
KENR9626
February 2011
Volume 2 of 2: Log Loader
568 Forestry Machine
Printed in U.S.A.© 2011 Caterpillar, All Rights Reserved
568 Log Loader
Hydraulic System
568 FM:
YJX1-UP
568 LL:
BRB1-UP
ONE POSITION TWO POSITION THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO - WAY THREE - WAY FOUR - WAY
SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION
(FIXED)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLE
INDICATES WIRE 135 IN HARNESS “AG”
325-PK-14
WIRE GAUGE
WIRE COLOR
CIRCUIT NUMBER
IDENTIFICATION
WIRE NUMBER IDENTIFICATION CODES
CURRENT STANDARD
PREVIOUS STANDARD
ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE
325-PK
WIRE COLOR
CIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR9626 VOL 2 of 2
36 Page, (Dimensions: 48 inches x 35 inches)
14
15
10
9
1
18
11
3635
21
23
34
GG
134630
32 4512
5
33
1
44
6
7
8
31
16
17
39
22
20
HH
II
JJ
EE
FF
KK
LL
AA
SOS DD
BB
CC
42
41
24
26
19
4 3
37
29
43 3828 27 2
40
PILOT LOCKSWING BRAKETRAVEL SPEED
Tap
Number
Description
Schematic
Location
AA Drive Pump Delivery Pressure B-4
BB Power Shift Pressure B-4
CC Idle Pump Delivery Pressure B-4
DD Pilot Pump Delivery Pressure A-8
EE Drive Pump Negative Flow Pressure D-4
FF Idle Pump Negative Flow Pressure D-4
GG Boom Regeneration Pressure G-9
HH Medium Delivery Pump Pressure G-10
II A2 Valve Retract Pressure H-10
JJ A2 Valve Extend Pressure H-10
KK A1 Valve Retract Pressure H-11
LL A1 Valve Extend Pressure H-11
SOS Fluid Sampl
ing Port A-7
Tap Location
Pressure and Sampling
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot 164-6981 1 D-7
Block 168-9759 2 I-8
Control Gp - Joystick (LH) 335-0511 3 G-7
Control Gp - Joystick (RH) 335-0511 4 G-6
Core As - Oil Cooler 339-5904 5 F-8
Filter And Valve Gp - Pilot Supply 158-8987 6 A-8
Filter Gp - Hydraulic Oil (Case Drain) 289-8194 7 A-7
Filter Gp - Hydraulic Oil Return 188-4145 8 A-6
Manifold Gp - Control (Fan) 204-2638 9 B-3
Manifold Gp - Control (Selector) 232-4053 10 D-7
Manifold Gp And S
olenoid Gp - Control (Heav
y Lift / Boom Reg) 323-7895 11 H-9
Motor Gp - Swing 334-9975 12 C-3
Motor Gp - Swing 334-9975 13 E-3
Motor Gp - Travel (LH) 215-2443 14 G-4
Motor Gp - Travel (RH) 215-2443 15 G-3
Pump Gp - Main Hydraulic 349-4065 16 C-4
Pump Gp - Medium Pressure 352-9154 17 C-5
Sensor Gp - Pressure (Boom Cylinder Head End) 344-7392 18 I-10
Sensor Gp - Pressure (Boom Down) 344-7390 19 F-7
Sensor Gp - Pressure (Drive Pump Loa
d Sens
e) 344-7390 20 E-5
Sensor Gp - Pressure (Drive Pump) 344-7392 21 A-11
Sensor Gp - Pressure (Idle Pump Load Sense) 344-7390 22 E-4
Sensor Gp - Pressure (Idle Pump) 344-7392 23 A-10
Sensor Gp - Pressure (Swing) 344-7390 24 F-6
Switch As - Pressure (Grapple Rotate) 327-4608 25 G-10
Switch As - Pressure (Pilot / Resolved) 319-7390 26 F-6
Switch As - Pressure (Pilot Travel (L)) 319-4407 27 H-6
Switch As - Pressure (Pilot Travel
(R)) 319-4407 28 H-5
Switc
h As - Pressure (Third Pedal / Straight Travel) 319-4407 29 H-3
Swivel Gp 234-4440 30 F-4
Tank Gp - Hydraulic 348-1345 31 A-6
Valve Gp - Bank 2 (Grapple Rotate) 352-9171 32 H-13
Valve Gp - Check 323-7502 33 F-9
Valve Gp - Load Control (Boom Drift Reduction) 335-0200 34 C-13
Valve Gp - Load Control (Stick Drift Reduction) 335-0200 35 E-8
Valve Gp - Main Control (Log Loader) 335-0420 36 F-12
Valve Gp - Pilot
(Third Pedal / Straight Trav
el) 206-3336 37 H-3
Valve Gp - Pilot (Travel) 310-0107 38 H-5
Valve Gp - Pump Control (Negative Flow) 310-0107 39 D-5
Valve Gp - Shuttle 323-7560 40 F-6
Valve Gp - Shuttle (Drive Load Sense) 276-9072 41 D-4
Valve Gp - Shuttle (Idle Load Sense) 276-9072 42 D-4
Valve Gp - Shuttle (Third Pedal / Straight Travel) 112-0083 43 H-2
Valve Gp - Solenoid (Grapple Rotate / Cylinders ) 259-7429 44 I-10
Valve Gp
- Solenoid (Heel / BNT Tilt) 162-7746 45 I-9
Valv
e Gp - Swing Cushion 334-9975 46 D-3
Component Location - Volume 2 Log Loader
SWIVEL / SWING / HEEL / GRAPPLE CONTROL
MAIN COTNROL VALVE
MAIN PUMP COMPARTMENT
HYDRAULIC OIL COOLING
CAB AND RISER COMPARTMENT
W/ 3RD PEDAL / TRAVEL STRAIGHT OPTION
BOOM CIRCUIT
TRAVEL MOTORS / PILOT MANIFOLD
KENR9626 VOL 2 of 2
36 Page, (Dimensions: 48 inches x 35 inches)
Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
VOLUME 2 of 2: LOG LOADER
SCHEMATIC PART NUMBER: 345-3853 CHANGE: 00 VERSION: -
MEDIA NUMBER: KENR9626
THIS SCHEMATIC IS FOR THE 568 LOG LOADER HYDRAULIC SYSTEM
A
B
C
D
E
F
12345678
91011121314
G
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12345678
91011121314
A
B
C
D
E
F
G
H
I
J
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
IDLE PUMP OUTPUT
DRIVE PUMP OUTPUT
MEDIUM PRESSURE PUMP OUTPUT
MAIN PUMP POWER SHIFT CIRCUIT
THIRD PEDAL / TRAVEL STRAIGHT CONTROL
SUPPLY LINE
GRAPPLE CYLINDER CONTROL CIRUIT
STICK CYLINDER CONTOL CIRCUIT
LEFT TRAVEL MOTOR CONTROL CIRCUIT
SWING BRAKE CONTROL CIRCUIT
SWING CONTROL CIRCUIT
DRAIN / RETURN LINE
GRAPPLE ROTATE CONTROL CIRUIT
HEAVY LIFT CONTROL CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
HEEL / BNT CYLINDER CONTROL CIRCUIT
RIGHT TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
FLEXXAIRE FAN CONTROL CIRCUIT
FF
EE
BB
CC
AA
GG
HH
LL KK
JJ
II
SOS
DD
IN
OUT
T
PG
PC
Pi1
DR3
Pi2
DR6
P1
BOOM
HEEL
STICK
SWING
JL1
IN R L
CLOSE
OPEN
DOWN
UP
T
B2
B1
A2
A1
P
PSA1
DR2
T-OUT2
T-OUT1
DR5
P2
P-IN
DR4
OIL COOLER
E
JLP
JLT
JRP
JRT
OUT
JL3
JL2
JL4
JR4
JR2
JR3
JR1
Pi1
Ps2
Pi2
D1
Ps1
B1
Dr1
Psv
a4
a1
a3
a2
a5
M1
M2
A4
D0
1
1
2
23
3
4
4
5
6
5
6
D
B
C
A
PAC
(EXT)
(RET)
(EXT)
(RET)
pST
pST
L1
L2
pL1f
pL2b
L5
pL5f
BP2
pR5f
R5
pR1f
R1
pR2b
R2
BPi
SP2
BPi
pL4bpR5fpL5f
NFC2NFC1
pR3f
pR3f
pL3f
pL5b
pR4b
pR5b
SPi
SPi
P1
P2
P1
P2
pL3b
pSR
pR6f
pR3b
pL3f
pL3b
R3
pBR
pR4b
R4
pL4b
L4
pSR
pR5b
pL5b
L6
pR6f
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3
B4
B5 B6 B7 B8C1
C2
C3 C4
C5
NFC1
NFC2
pL7f
pR7f
R7
TRAVEL(L)
TRAVEL(R)
STR TRAVEL
BOOM(1)
BOOM(2)
SWING
STICK(2)
STICK(1)
(FWD)
(FWD)
(BKWD)
(BKWD)
(DOWN)
(UP)
(UP)
(L)
(R)
(OUT)
(OUT)
(IN)
SDr
SP1
R6
ST
L3
BP1
BT
dR1b
drR
(CLOSE)
(OPEN)
TILT
T
BT3
ST6
P
T
TRAVEL(L)
TRAVEL(R)
FWD
BKWD
FWD
BKWD
1
5
2 4
6
3
pL1f
pR1f pR2b
pL2b
STICK
CYLINDER
HEEL/BNT
TILT
CYLINDER
L5
R5
L6
BP2
R3
SP2
L7
SPBC
2STC
CDF
MU
PiH
T
X
X
G
MA
MB
M
S
Bri
Bre
G
MA
MB
S
M
Bri
Bre
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
T
ABA B
R1 L1 L2
R2
PG
DB
M
A
B
SWING MOTOR
PB
PA
L4
R4
DE
A1
B1
2STC
CDF
SPBC
MU
PG
DB
MU
PB
PA
DE
A
B
BOOM CYLINDER
R7
L7
GRAPPLE MULTI CYLINDER
SWING MOTOR
(BOOM
REGEN)
(HEAVY LIFT)
pBR
P1
P2
A1
A2
PiH
T
pR7b
pL7b
dST
BDr
BDr
PSA2
OPT BNT
ROTATE AND
OUTRIGGER
T0
T
A
B
dFV
dFV
M
P
A
B
T
ROTATE
CW
ROTATE
CCW
(CCW)
(CW)
pL6f
(BKWD)
(BKWD)
(FWD)
(FWD)
PUMP-S1
PUMP-S2
T
P
DR1
DR1
T
P
A1
A2
A3
A4
T
T
T
P
S
L
L
To
TRAVEL(L)
TRAVEL(R)
T1
T5
BACK
FWD
BACK
FWD
T2
T4
T6
T3
TT
TP
CTR2
ATR2
CTR3
TR3
TR4
TR1
TR2
CTR1
CTR4
ATR1
RP
RT
1
2
pR1f
pL1f
pL2b
pR2b
pL7fpR7f
B
B
(32) VALVE GP - BANK 2
(GRAPPLE ROTATE)
352-9171
(44) VALVE GP - SOLENOID
(GRAPPLE ROTATE / CYLINDERS)
259-7429
(45) VALVE GP - SOLENOID
(HEEL / BNT TILT)
162-7746
(11) MANIFOLD GP AND SOL ENOID GP - Control
(HEAVY LIFT / BOOM REGEN))
323-7895
(2) BLOCK
168-9759
(38) VALVE GP - PILOT (TRAVEL)
310-0107
VALVE GP - PILOT (TRAVEL)
Refer to Location I-5
BLOCK
Refer To Loc I-7
(43) VALVE GP - SHUTTLE
(THIRD PEDAL / STRAIGHT
TRAVEL)
112-0083
(37) VALVE GP - PILOT
(THIRD PEDAL / STRAIGHT
TRAVEL)
206-3336
(34) VALVE GP - LOAD CONTROL
(BOOM DRIFT REDUCTION)
335-0200
(35) VALVE GP - LOAD CONTROL
(STICK DRIFT REDUCTION)
335-0200
(36) VALVE GP - MAIN CONTROL
(LOG LOADER)
335-0420
(33) VALVE GP - CHECK
323-7502
(5) CORE AS - OIL COOLER
339-5904
(10) MANIFOLD GP - CONTROL
(SELECTER)
232-4053
(1)ACCUMULATOR GP - PILOT
164-6981
(6) FILTER AND VALVE GP - PILOT SUPPLY
158-8987
(7) FILTER GP - HYD OIL
(CASE DRAIN)
289-8194
(8) FILTER GP - HYD OIL RETURN
188-4145
(16) PUMP GP - MAIN HYD
349-4065
(17) PUMP GP - MEDIUM
PRESSURE
352-9154
(39) VALVE GP - PUMP CONTROL
(NEGATIVE FLOW)
310-0107
(41) VALVE GP -
SHUTTLE
(DRIVE LOAD SENSE)
276-9072
(42) VALVE GP -
SHUTTLE
(IDLE LOAD
SENSE)
276-9072
(46) VALVE GP -
SWING
CUSHION
322-8715
(12) MOTOR GP - SWING
334-9975
(13) MOTOR GP - SWING
334-9975
(9) MANIFOLD GP -
CONTROL (FAN)
308-2638
(3) CONTROL GP -
JOYSTIC (LH)
335-0511
(4) CONTROL GP -
JOYSTIC (RH)
335-0511
(40) VALVE GP -
SHUTTLE
323-7560
(15) MOTOR GP -
TRAVEL (RH)
215-2443
(14) MOTOR GP -
TRAVEL (LH)
215-2443
SWITCH AS -
PRESSURE
(PILOT TRAVEL (R))
Refer To Loc H-5
SWITCH AS -
PRESSURE
(PILOT TRAVEL (L))
Refer To Loc H-6
(28) SWITCH AS -
PRESSURE
(PILOT TRAVEL (R))
319-4407
(27) SWITCH AS -
PRESSURE
(PILOT TRAVEL (L))
319-4407
(29) SWITCH AS -
PRESSURE
(THIRD PEDAL / ST TRAVEL)
319-4407
(20) SENSOR GP -
PRESSURE
(DRIVE PUMP LOAD SENSE)
344-7390
(22) SENSOR GP -
PRESSURE
(IDLE PUMP LOAD
SENSE)
344-7390
(30) SWIVEL GP
234-4440
(24) SENSOR GP -
PRESSURE
(SWING)
344-7390
(19) SENSOR GP -
PRESSURE
(BOOM DOWN)
344-7390
(26) SWITCH AS -
PRESSURE
(PILOT / RESOLVED)
319-4407
(18) SENSOR GP -
PRESSURE
(BOOM CYL HEAD END)
344-7392
(23) SENSOR GP - PRESSURE
IDLE PUMP
344-7392
(21) SENSOR GP - PRESSURE
DRIVE PUMP
344-7392
C
THIRD PEDAL / STRAIGHT TRAVEL OPTION
(31) TANK GP - HYD OIL
348-1345
FINE
SWING
POWER
SHIFT
PILOT LOCK
SWING BRAKE
TRAVEL SPEED
STRAIGHT
TRAVEL
(25) SWITCH AS - PRESSURE
(GRAPPLE ROTATE)
327-4608
