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SJ20
Skyjack SJ20 Service Manual
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34
SJ20
238886ABA
Section 3 – System Component Identification and Schematics
Electrical Symbol Chart
HOURMETER
LIGHT
HYDRAULIC
VAL
VE COIL
PROPORTIONAL
HYDRAULIC
VAL
VE COIL
ELECTRIC
MOTOR
HORN
EMERGENCY
STOP BUTTON
RESISTOR
LEVEL SENSOR
DOUBLE POLE
SINGLE THROW
RELA
Y
DIODE
CIRCUITS CROSSING
NO CONNECTION
CIRCUITS
CONNECTED
BA
T
TERY
FUSE
GROUND
CIRCUIT
BREAKER
VOLT METER
CAP
ACITOR
POTENTIOMETER
SINGLE POLE
DOUBLE THROW
RELA
Y
TRIPLE POLE
DOUBLE THROW
RELA
Y
RELA
Y
RELA
Y
DOUBLE POLE
DOUBLE THROW
SINGLE POLE
SINGLE THROWN
TIL
T SWITCH
CAM OPERA
TED
LIMIT SWITCH
LIMIT SWITCH
ROT
ARY SWITCH
PUSH BUTTON
TOGGLE SWITCH
FOOT SWITCH
KEY SWITCH
TEMPERA
TURE
SWITCH
LIMIT SWITCH
LIMIT SWITCH
CL
OSED
LIMIT SWITCH
LIMIT SWITCH
SILICON
CONTROLLED
RECTIFIER
PROXIMITY
SWITCH
PNP
TRANSISTOR
NPN
TRANSISTOR
VACUUM
SWITCH
RHEOSTAT
3.1
Elec
tric
al Sy
mbol
Char
t
T
abl
e
33
35
Table of Contents
Default Chapter
5
Table of Contents
5
Section 1 - Scheduled Maintenance
9
Read and Heed
9
Mobile Elevating Work Platform (MEWP) Definition
9
Purpose of Equipment
9
Use of Equipment
9
Manual
9
Service Policy and Warranty
9
Operator Safety Reminders, Warnings and Precautions
9
Maintenance and Inspection Schedule
10
Owner's Annual Inspection Record
10
Replacement Parts
10
Maintenance and Service Safety Tips
10
Hydraulic System & Component Maintenance and Repair
11
Maintenance Hints
11
About this Section
12
Service Bulletins
12
Maintenance and Inspection
12
Maintenance Instructions
12
Owner's Annual Inspection Record
13
Frequent/Periodic/Annual/Pre-Delivery Inspection Checklist
14
Visual and Daily Maintenance Inspections
15
Labels, B
15
Electrical, B
15
Limit Switches, B
15
Hydraulic, B
15
Base
16
Wheel/Tire Assembly
16
Platform Assembly
18
Hydraulic/Electrical Compartment
19
Lift Mechanism
21
10 Optional Equipment and Attachments
21
Section 2 - Maintenance Tables and Diagrams
23
Standard Hose Numbering System
23
Specifications and Features
25
Maximum Platform Capacities (Evenly Distributed)
26
Floor Loading Pressure ANSI/CSA
27
Torque Specifications
28
Torque Specifications for Fasteners (Imperial)
29
Torque Specifications for Fasteners (Metric)
30
Torque Specifications for Hydraulic Couplings & Hoses
31
Section 3 - System Component Identification and Schematics
33
Electrical Symbol Chart
34
Hydraulic Symbol Chart
35
Wire Number and Color Code
36
Hydraulic Parts List
37
Electrical Parts List
38
Hydraulic Connections
39
Platform Control Box Wiring
40
Platform Control Cable Wiring
41
Platform Control Box Wiring - SGLE
42
Platform Control Cable Wiring - SGLE
43
Beeper
44
Base Limit Switch
44
Platform Limit Switches
44
Motor and Controller Connections
45
Mast Cable
46
Major Component Identification
47
Hydraulic Schematic
48
Base Control Wiring
49
Main Harness - ZAPI a
50
Main Harness Wiring - ZAPI a
51
Main Harness - ZAPI B
52
Electrical Schematic
53
Section 4 - Troubleshooting Information
55
Introduction
55
Electrical System
56
All Controls Inoperative
56
No Lift or Steer Functions
57
No Lift from Base or Platform
57
No Lower from Base or Platform
58
No Lift or Lower from Base Controls
58
No Lift from Base Controls
58
No Lower from Base Controls
58
No Functions from Platform Controls
58
No Lift/Lower from Platform Controls
59
10 No Steer Left
59
11 No Steer Right
59
12 No Drive
59
Hydraulic System
60
All Hydraulic Controls Inoperative (no Lift or Steer Functions)
60
No Lift Function
60
No Lower Function
60
No Steer Left And/Or Right
60
Section 5 - Procedures
61
General
61
Safety and Workmanship
61
Display Module
62
Display Messages
62
Wheel Reinstallation and Torquing Procedure
66
Battery Maintenance
69
Charger Maintenance
69
Charger Profiles
70
Charger Troubleshooting
71
Charger Error Codes
72
Mast Lubrication
76
Outer Mast Lubrication
76
Inner Mast Lubrication
77
Platform Removal
78
Platform Installation
81
Lift Cylinder Removal
83
Lift Cylinder Installation
85
Mast and Lift Cylinder Removal
87
Mast and Lift Cylinder Installation
89
Wear Pad Replacement
92
Mast Identification
92
Remove Mast 5 and Wear Pads
92
Remove Mast 4 through 2 and Wear Pads
95
Replace the Top Wear Pads
97
Install the Mast Cable
98
Install the Masts 2 through 4 and Bottom Wear Pads
99
Install the Mast 5 and Bottom Wear Pads
101
Install the Lift Cylinders and Platform
104
Railing Maintenance and Repair
105
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Skyjack SJ20 Specifications
General
Brand
Skyjack
Model
SJ20
Category
Lifting Systems
Language
English
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