The document contains shop manuals for a wheel loader model 70Z7B. It includes sections on general information, function and structure, operational performance tests, and troubleshooting. The general information section provides specifications for the loader and outlines the layout of its main components such as the engine, hydraulic and electrical systems, drive unit, and axles. The function and structure section provides more detailed diagrams and specifications for individual components.

1. ©2016 KCM Corporation. All rights reserved. Printed in Japan (K)
（アメリカ用）
93208-00850
November 2016
SHOP MANUAL
WHEEL LOADER
70Z7B
General Information
Function & Structure
Powered by CUMMINS QSB6.7 Engine
Serial No. 70C8-5001 and up
General
Information
70Z7B
SHOP
MANUAL
93208-00850
Function
&
Structure

2. ©2016 KCM Corporation. All rights reserved. Printed in Japan (K)
( アメリカ用 )
93208-00860
November 2016
SHOP MANUAL
WHEEL LOADER
70Z7B
Operational Performance Test
Troubleshooting
Powered by CUMMINS QSB6.7 Engine
Serial No. 70C8-5001 and up
Operational
Performance
Test
70Z7B
SHOP
MANUAL
93208-00860
Troubleshooting

3. SECTION AND GROUP
CONTENTS
SHOP MANUAL
(Function & Structure)
All information, illustrations and
specifications in this manual are based on
the latest product information available
at the time of publication. The right is
reserved to make changes at any time
without notice.
93208-00850
SECTION 1 GENERAL
Group 1 Specifications
Group 2 Component Layout
Group 3 Component Specifications
SECTION 2 SYSTEM
Group 1 Controller
Group 2 Control System
Group 3 Engine System
Group 4 Hydraulic System
Group 5 Electrical System
SECTION 3 COMPONENT OPERATION
Group 1 Pump Device
Group 2 Control Valve
Group 3 Cooling Fan System
Group 4 Steering Pilot Valve
Group 5 Priority Valve
Group 6 Pilot Valve
Group 7 Brake Charge Valve/Manifold Valve
Group 8 Drive Unit
Group 9 Axle
Group 10 Brake Valve
Group 11 Ride Control Valve
Group 12 Others

4. SECTION AND GROUP
CONTENTS
SHOP MANUAL
(Troubleshooting)
All information, illustrations and
specifications in this manual are based on
the latest product information available
at the time of publication. The right is
reserved to make changes at any time
without notice.
SECTION 4 OPERATIONAL
PERFORMANCE TEST
Group 1 Introduction
Group 2 Standard
Group 3 Engine Test
Group 4 Machine Performance Test
Group 5 Component Test
Group 6 Adjustment
SECTION 5 TROUBLESHOOTING
Group 1 Diagnosing Procedure
Group 2 Monitor
Group 3 e-Service
Group 4 Component Layout
Group 5 Troubleshooting A
Group 6 Troubleshooting B
Group 7 Air Conditioner
93208-00860

5. 70Z7B F&S (US)
Group 1 Specifications
Specifications.......................................................................T1-1-1
Group 2 Component Layout
Main Component (Overview).........................................T1-2-1
Main Component................................................................T1-2-3
Electrical System (Overview) ..........................................T1-2-5
Air Cleaner and Radiator Assembly..............................T1-2-6
Battery Box............................................................................T1-2-8
Hydraulic Tank......................................................................T1-2-9
Fuel Tank ..............................................................................T1-2-10
Drive Unit.............................................................................T1-2-11
Front Axle.............................................................................T1-2-12
Cab.........................................................................................T1-2-13
Engine...................................................................................T1-2-19
Aftertreatment Device....................................................T1-2-20
Fan Valve (Option).............................................................T1-2-21
Priority Valve.......................................................................T1-2-21
Pump Device ......................................................................T1-2-22
Control Valve.......................................................................T1-2-22
Manifold Valve....................................................................T1-2-23
Parking Brake Solenoid Valve Block ...........................T1-2-23
Brake Charge Valve (Unloader Valve).........................T1-2-23
Ride Control Valve (Option)...........................................T1-2-24
Secondary Steering Block (Option)............................T1-2-25
Secondary Steering Pump (Option)...........................T1-2-25
Flow Regulator Valve.......................................................T1-2-25
DEF Tank...............................................................................T1-2-26
DEF Supply Module..........................................................T1-2-26
Group 3 Component Specifications
Engine.....................................................................................T1-3-1
Engine Accessories.............................................................T1-3-5
Hydraulic Component.......................................................T1-3-6
Electrical Component......................................................T1-3-11
SECTION 1
GENERAL
CONTENTS

6. T1-1-1
Group 1 Specifications
SECTION 1 GENERAL
Specifications
Model - 70Z7B
Bucket Capacity: heaped m3
(Y3
) 2.8 (3.7)
Operating Weight kg (lbs) 14560 (32100)
Tipping Load kg (lbs) 10440 (23020)
Engine - CUMMINS QSB6.7
A: Overall Length mm (in) 8000 (315)
B: Overall Width (Bucket) mm (in) 2730 (107)
C: Overall Height mm (in) 3280 (129)
D: Wheel Base mm (in) 3100 (122)
E: Tread (front and rear tires) mm (in) 2050 (81)
F: Ground Clearance mm (in) 395 (16)
G: Bucket Hinge Height mm (in) 3920 (155)
H: Dumping Clearance (45 °) mm (in) 2760 (109)
I: Dumping Reach (45 °) mm (in) 1110 (44)
R1: Minimum Rotation Radius mm (in) 5580 (220)
R2: Minimum Rotation Radius mm (in) 6230 (245)
Travel Speed Forward/Reverse (at Power
mode)
km/h (mph)
38.5 (23.9)/26.5 (16.5)
(38.5 (23.9)/28.3 (17.6))
Transmission Speeds (F/R) - 5/3
Articulation Angle (Left/Right) deg ( ° ) 40
Tire Size - 20.5-25-12PR (L2)
fNOTE: These specifications are subject to change without notice.
B G
C
40 °
R2
R1
E
H
45 °
I
F
D
A
MPD8-12-001

7. T1-2-1
SECTION 1 GENERAL
Group 2 Component Layout
Main Component (Overview)
1- Bucket
2- Bucket Link
3- Bell Crank (Lever)
4- Bucket Cylinder
5- Front Combination Light
(Headlight, Turn Signal Light,
Clearance Light, Hazard Light)
(2 Used)
6- Horn (2 Used)
7- Front Work Light (2 Used)
8- Cab (Refer to T1-2-13.)
9- DEF Tank Box
10- Lift Arm Cylinder (2 Used)
11- Lift Arm
1
2
3
4
5
6
7 8
9
10
11
TNEK-01-02-007

8. T1-2-2
SECTION 1 GENERAL
Group 2 Component Layout
12
13
14
15
TNEK-01-02-008
12- Rear Work Light (2 Used) 13- Rain Cap/Pre-Cleaner (Option) 14- Battery Box (Refer to T1-2-8.) 15- Rear Combination Light (Turn
Signal Light, Hazard Light, Tail
Light, Brake Light) (2 Used)

9. T1-2-3
SECTION 1 GENERAL
Group 2 Component Layout
1- Air Cleaner and Radiator
Assembly (Refer to T1-2-6.)
2- Aftertreatment Device (Refer
to T1-2-20.)
3- Hydraulic Tank (Refer to T1-
2-9.)
4- Parking Brake Solenoid Valve
(Refer to T1-2-23.)
5- Manifold Valve (Refer to T1-
2-23.)
6- Brake Valve
7- Steering Pilot Valve
8- Multiple Control Valve (Refer
to T1-2-22.)
9- Ride Control Valve (Refer to
T1-2-24.)
10- Ride Control Accumulator
(Option)
11- Brake Charge Valve (Unloader
Valve) (Refer to T1-2-23.)
12- Pilot Filter
13- Service Brake Accumulator (2
Used)
14- Flow Regulator Valve (Refer to
T1-2-25.)
15- Pilot Valve
16- Engine (Refer to T1-2-19.)
17- Priority Valve
Main Component
1 2 3 4 5 6
7
8
9
10
11
12
13
17
14
15
16
TPD8-01-02-001

10. T1-2-4
SECTION 1 GENERAL
Group 2 Component Layout
17- Front Axle (Refer to T1-2-12.)
19- Steering Accumulator (2 Used)
21- Pump Device (Refer to T1-2-
22.)
22- Drive Unit (Refer to T1-2-11.)
23- Fuel Prefilter
24- Fuel Tank (Refer to T1-2-10.)
25- DEF Supply Module
26- DEF Tank
27- Torque Converter Cooler
Check Valve
28- Rear Axle
29- Third (Rear) Propeller Shaft
30- Second (Front) Propeller Shaft
31- Steering Cylinder (2 Used)
17 19 21 22
23
24
25
26
27
28
29
30
31
TPD8-01-02-002

11. T1-2-5
SECTION 1 GENERAL
Group 2 Component Layout
Electrical System (Overview)
1- Engine (Refer to T1-2-19.)
2- Hydraulic Tank (Refer to T1-
2-9.)
3- Cab (Refer to T1-2-13.)
4- Bucket Proximity Switch
5- Lift Arm Proximity Switch
6- Battery Box (Refer to T1-2-8.)
7- Fuel Tank (Refer to T1-2-10.)
8- DEF Tank (Refer to T1-2-25.)
9- Backup Alarm
10- DEF Supply Module (Refer to
T1-2-25.)
3
2
1
7
6
10
9
8
5
4
TNEK-01-02-003

12. T1-2-6
SECTION 1 GENERAL
Group 2 Component Layout
Air Cleaner and Radiator Assembly
1- Air Cleaner
2- Radiator Assembly (Refer to
T1-2-7.)
3- Fan Valve (Refer to T1-2-21.)
4- Intercooler Outlet
Temperature Sensor
5- Reserve Tank
6- Air Filter Restriction Switch
7- TBAP Sensor
8- Coolant Level Sensor
2
1
5
6
1
7
3
A
View A
8
4
5
TNEK-01-02-012
TNEK-01-02-011

13. T1-2-7
SECTION 1 GENERAL
Group 2 Component Layout
Radiator Assembly
1
2
3
A
View A
4
5
a
a- Machine Front Side
1- Reserve Tank
2- Radiator
3- Oil Cooler
4- Intercooler
5- Torque Converter Cooler
6- Fan Motor
TNEK-01-02-009
6
a
TNEK-01-02-010

14. T1-2-8
SECTION 1 GENERAL
Group 2 Component Layout
Battery Box
1- Battery Box
2- Battery (2 Used)
3- Battery Disconnect Switch
4- Battery Relay
5- Fusible Link (70 A)
6- Fusible Link (140 A)
7- Fusible Link (65 A)
8- Fusible Link (45 A)
9- Fusible Link (65 A)
10- Starter Relay
11- Intake Air Heater Relay
1
2
2
3
5
4
6
7
8
9
10
A
Detail A
11
MNEK-01-015 TNEK-01-02-004

15. T1-2-9
SECTION 1 GENERAL
Group 2 Component Layout
Hydraulic Tank
1- Hydraulic Tank
2- Hydraulic Oil Level Sensor
3- Washer Fluid Tank 4- Hydraulic Oil Temperature
Sensor
5- Secondary Steering Pump
(Option) (Refer to T1-2-25.)
1 2
3
4
5
a
TNEG-01-02-014
a- Machine Front Side

16. T1-2-10
SECTION 1 GENERAL
Group 2 Component Layout
Fuel Tank
1
5
4
3
2
a
TNEK-01-02-013
1- Fuel Tank
2- Fuel Level Sensor
3- Fuel Pump
4- Water Separator Sensor
5- Fuel Prefilter
a- Machine Front Side

17. T1-2-11
SECTION 1 GENERAL
Group 2 Component Layout
Drive Unit
View A
A
7
1
2
3
6
5
4
8
9
1- Transmission Intermediate
Shaft Sensor
2- Torque Converter Output
Speed Sensor
3- Transmission Oil Filter
4- Machine Speed Sensor
5- Transmission Oil Filter
Restriction Switch
6- Torque Converter Input Speed
Sensor
7- Breather
8- Torque Converter Oil
Temperature Sensor
9- Transmission Control Valve
10- Proportional Solenoid Valve
Y1 (For Fast-Speed Forward
Clutch)
11- Proportional Solenoid Valve Y2
(For Reverse Clutch)
12- Proportional Solenoid Valve Y3
(For 1st Speed Clutch)
13- Proportional Solenoid Valve Y4
(For 3rd Speed Clutch)
14- Proportional Solenoid Valve
Y5 (For Slow-Speed Forward
Clutch)
15- Proportional Solenoid Valve Y6
(For 2nd Speed Clutch)
10
15
14
13
11
12
a
TNEK-01-02-014
TNEK-01-02-015
TNEK-01-02-016
a- Machine Front Side

18. T1-2-12
SECTION 1 GENERAL
Group 2 Component Layout
Front Axle
1- Pressure Sensor (Brake
Secondary Pressure)
2- Axle Oil Temperature Sensor
1
2
TNEE-01-02-018

19. T1-2-13
SECTION 1 GENERAL
Group 2 Component Layout
1- Radio
2- Upper Switch Panel (Option)
3- Speaker (2 Used)
4- Rear Wiper Motor
5- Accelerator Pedal Sensor
6- Brake Angle Sensor
7- Brake Light Switch
8- Front Wiper Motor
9- Front Wiper (1) Relay
10- Front Wiper (2) Relay
11- GPS Antenna (Option)
12- Communication Terminal
Antenna
a- Front Console (Refer to T1-2-
14.)
b- Right Console (Refer to T1-2-
15.)
c- Rear Console (Refer to T1-2-
16.)
e- Control Unit (Refer to T1-2-17.)
Detail D
View F
10
8
9
TNEG-01-02-041
TNEG-01-02-002
b
F
e
c
3
3 2
11 12
1
D
a
e
7 6 5
4
Cab
TNEK-01-02-017

20. T1-2-14
SECTION 1 GENERAL
Group 2 Component Layout
1- Hazard Light Switch
2- Work Light Switch
3- Parking Brake Switch
4- Neutral Lever Lock for
Forward/Reverse Lever
5- Steering Wheel
6- Monitor Panel (Refer to T1-
2-18.)
7- Horn
8- Accelerator Pedal
9- Brake/ Declutch Pedal (Both at
left and right are interlocked.)
10- Front/Rear Wiper Switch
11- Forward/Reverse Lever/Shift
Switch
12- Turn Signal Lever/Light
Switch/Dimmer Switch
13- Key Switch
14- Multi-Function Monitor/Air
Conditioner Control Panel
15- Cigar Lighter
Front Console
MNEC-01-038
MNEC-01-037
1 2 3 4 5 6 7
8
9
11
10
12 13
15
14
MNEC-01-036

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22. T1-2-15
SECTION 1 GENERAL
Group 2 Component Layout
Right Console
Fingertip Control Lever Type
fNOTE: * The layout of each control lever may depend
on the machine specification.
Multi-Function Joystick Lever Type
12
11
10
9
8
7
6
5
4
3*(1)
2*(3)
1*(2)
18
21
26
25
20
19
17
16
15
14
13
12
11
10
22
8
7
6
5
23
24
21 19 1
17
16
15
14
13
1*- Auxiliary Control Lever
(Option)
2*- Bucket Control Lever
3*- Lift Arm Control Lever
4- Forward/Reverse Switch
5- Control Lever Lock Switch
6- Declutch Position Switch
7- Travel Mode Switch
8- Power Mode Switch
9- Forward/Reverse Selector
Switch
10- Fan Reversing Switch
11- Auxiliary
12- Hydraulic Coupler Switch
(Option)
13- Secondary Steering Check
Switch (Option)
14- Manual Regeneration Switch
15- Auxiliary
16- First Speed Fixed Switch
17- Ride Control Switch (Option)
18- Hold Switch
19- DSS (Down Shift Switch)
20- Horn Switch
21- Quick Power Switch
22- Forward/Reverse Selector
Switch
23- Forward/Reverse Switch
24- Multi-Function Joystick Lever
25- Hold Switch (Under the Lever)
26- Horn Switch (Under the Lever)
MNEC-01-041 MNEC-01-042
MNEC-01-043
MNEC-01-044

23. T1-2-16
SECTION 1 GENERAL
Group 2 Component Layout
Rear Console
1- Fuse Box B
2- Fuse Box A
3- MPDr. Connector
4- ECM Main Relay
5- Starter Cut Relay (C-R1)
6- Fuel Pump Relay (C-R2)
7- DEF Heater Relay 1 (C-R3)
8- DEF Heater Relay 2 (C-R4)
9- DEF Heater Relay 3 (C-R5)
10- Supply Module Relay (C-R6)
11- DEF Sensor Relay (C-R7)
12- Parking Brake Light Relay
(C-R8)
13- ECM Timer Relay (C-R9)
14- Not Used
15- Headlight Relay (Left) (A-R1)
16- Headlight Relay (Right) (A-R2)
17- High Beam Relay (A-R3)
18- Bucket Leveler Relay (A-R4)
19- Back Buzzer Relay (A-R5)
20- Work Light (Front) Relay (A-R6)
21- Work Light (Rear) Relay (A-R7)
22- Right Turn Signal Light Relay
(A-R8)
23- Horn Relay (A-R9)
24- Secondary Steering Relay
(A-R10)
25- Parking Brake Relay 1 (B-R1)
26- Parking Brake Relay 2 (B-R2)
27- Control Lever Lock Relay (B-R3)
28- Brake Light Relay (B-R4)
29- Load Dump Relay (B-R5)
30- Neutral Relay (B-R6)
31- Left Turn Signal Light Relay
(B-R7)
32- Front Washer Relay (B-R8)
33- Rear Wiper Relay (B-R9)
34- Rear Washer Relay (B-R10)
35- Relay Box C
36- Relay Box A
37- Relay Box B
38- Engine Data Link Connector
12 11 10
9 8 7 6 5
35
4
36
37
3
2
1
13
14
18
19
33
23
34
24
28
29
17
32
22
27
16
31
21
26
15
30
20
25
TNEK-01-02-018
38

24. T1-2-17
SECTION 1 GENERAL
Group 2 Component Layout
Control Unit
1- Monitor Controller 2- TCU (Transmission Control
Unit)
3- MC (Main Controller)
4- GSM/GPS (Option)
5- Flasher Relay
6- Air Conditioner Controller
a- Machine Front Side b- Monitor
2
6
5
4
3
1
b
a
a
TNEG-01-02-004
TNED-01-02-029
TNEK-01-02-019
TNEK-01-02-020