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SJ4726
Skyjack SJ4726 Service Manual
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76
SJ3220, SJ3226, SJ4720, SJ4726, SJ4732
223198ABA
3.28
Hydraul
ic S
chema
tics
- SJ
3220/
26 A
NSI/CSA
M216
186A
D
T
B
P
A
P
A
T
B
4H-24A
LEFT
4H-23A
RIGHT
R1
RELIEF
VAL
VE
3250 psi
3H-17
BRAKE
RELEASE
3H-14
LIFT
R2
RELIEF
VAL
VE
CB1
4000 PSI
10:1
4H-16
FORWARD
4H-15
REVERSE
MB1 MAIN MANIFOLD
SAE
08
P1
SYSTEM PUMP
(3.59 CC / 0.219 CIR)
F1
FIL
TER
SAE
12
SAE
06
C1
STEERING
CYLINDER
O1
.040"
SAE
06
SAE
06
SAE
06
SAE
06
A=REVERSE
B=FORWARD
A
B
M1
LEFT
DRIVE
MOTOR
SAE
06
SAE
06
A
M2
RIGHT
DRIVE
MOTOR
A=FORWARD
B=REVERSE
B
SAE
06
SAE
06
C2
LOWER LIFT
CYLINDER
2H-13-1
PT1
PRESSURE
TRANSDUCER
MB4
HOLDING
MANIFOLD
SAE
06
C3
UPPER LIFT
CYLINDER
2H-13-2
MB3
HOLDING
MANIFOLD
SAE
04
R4
RELIEF
VAL
VE
R3
RELIEF
VAL
VE
3H-18A-1
SPEED
VAL
VE B
3H-18A-2
SPEED
VAL
VE A
2H-18A
DIFFERENTIAL
VAL
VE
O3
.040"
FD1
FLOW
DIVIDER
COMBINER
V1
FREE-
WHEEL
VAL
VE
MB2 DRIVE MANIFOLD
SAE
06
2H-13-1
PT1
PRESSURE
TRANSDUCER
MB5
HOLDING
MANIFOLD
SN1
SNUBBER
C2
LOWER LIFT
CYLINDER
P
A
T
B
4H-26
PLAF
EXTEND
4H-27
PLAF
RETRACT
O6
.051"
C4
BRAKE
CYLINDER
C5
POWER DECK
CYLINDER
QD1
OPTION
SN1
SNUBBER
PORT
PLUGGED
O4
.081"
O5
.106"
SAE
06
SAE
04
SAE
04
O2
.031"
3226
3220
M
1
3
2
1
3
2
Stroke
Bore
3.998
37.321
Stroke
Bore
4.0
49.06
2
1
2
1
Bore
Rod
Stroke
1.5
0.75
4.87
1
2
3
4
2
2
1
SAE 6
FRONT LEFT SAE 6
SAE 6
REAR LEFT SAE 6
FRONT RIGHT SAE 6
REAR RIGHT SAE 6
1
3
2
1
3
2
SAE 6
Stroke
Bore
3.998
37.321
Bore
Rod
Stroke
1.5
0.75
2.37
Bore
Rod
Stroke
1.502
1
69.13
75
77
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
Service Policy and Warranty
9
Ownership of MEWP
9
Optional Equipment
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
12
About this Section
13
Maintenance Instructions
13
Owner's Annual Inspection Record
14
Frequent/Periodic/Annual/Pre-Delivery Inspection Checklist
15
General Inspections
16
Service Bulletins (B)
16
Annual Inspections (B)
16
Labels
16
Pothole Protection Limit
16
Switches(B)
16
Base Inspection
17
Scissors Inspection
21
Platform Inspection
25
Function Tests
26
Section 2 - Maintenance Tables and Diagrams
27
Standard Hose Numbering System
27
Torque Specifications for Fasteners (US)
29
Torque Specifications for Fasteners (Metric)
30
Torque Specifications for Hydraulic Couplings & Hoses
31
Specifications & Features - ANSI/CSA
32
Specifications & Features - ANSI/CSA Powerdeck and ACPP
33
Specifications & Features - CE
34
Specifications & Features - as
35
Specifications & Features - KC
36
Maximum Platform Capacities (Evenly Distributed)
37
Ansi/Csa
37
Maximum Platform Capacities (Evenly Distributed)
38
Ce/As/Kc
38
Floor Loading Pressure (ANSI/CSA)
39
Floor Loading Pressure (CE)
40
Floor Loading Pressure (AS)
41
Floor Loading Pressure (KC)
42
Torque Specifications
43
Section 3 - System Component Identification and Schematics
45
Electrical Symbol Chart
46
Hydraulic Symbol Chart
47
Wire Number and Color Code
48
Hydraulic Parts List
49
Electrical Parts List
51
Drive Manifold MB2 - SJ3220/26 & SJ4726/32 (ANSI/CSA)
53
Drive Manifold MB2 - SJ3220/26 (CE, as & KC)
54
Drive Manifold MB2 - SJ4720/26/32 (CE, as & KC)
55
Brake Manifold MB6 - SJ4720/26/32 (CE, as & KC)
55
Single Lift Cylinder Manifold MB5 - SJ3220, SJ4720
56
Dual Lift Cylinder Manifold MB3 & MB4 - SJ3226, SJ4726/32
57
Powerdeck Manifold MB1 - SJ3220, SJ4720
58
Platform Control Box Wiring
59
Platform Control Box Wiring - SGLE
60
Platform Control Box Wiring - ACPP
61
Base to Platform Control Cable
62
Base Control Wiring
63
Base Control Wiring - ACPP
64
Emergency Lowering Switch Wiring
65
Limit Switch Wiring
66
Limit Switch Wiring - Anti-Overrising Posts (KC Only)
67
Anti-Overrising Harnesses (KC Only)
68
Electrical Harnesses
69
Powerdeck Harnesses
70
Interlocks Harness (ANSI/CSA ACPP)
72
Outdoor Switch Wiring and Harness (SJ3226 ANSI/CSA Only)
73
Main Manifold MB1
75
Hydraulic Schematics - SJ3220/26 ANSI/CSA
76
Hydraulic Schematics - SJ3220/26 CE
77
Hydraulic Schematics - SJ3220/26 AS/KC
78
Hydraulic Schematics - SJ4720/26/32 ANSI/CSA
79
Hydraulic Schematics - SJ4720/26/32 CE
80
Hydraulic Schematics - SJ4720/26/32 AS/KC
81
Telematics Harness
82
Electrical Schematic - SJ3220, SJ4726/32 - All Option (ANSI/CSA)
83
Electrical Schematic - SJ3226 - All Option (ANSI/CSA)
84
Electrical Schematic - All Option (CE)
85
Electrical Schematic - All Option (AS)
86
Electrical Schematic - All Option (KC)
87
Electrical Schematic - SJ4726 - ACPP
88
Section 4 - Troubleshooting Information
94
Introduction
94
Electrical System
95
All Controls Inoperative
95
All Controls Except for down Function Inoperative
97
All Controls Inoperative from Base Control Console
98
No up Function from Base Control Console
99
No down Function from Base Control Console
100
No Emergency down Function from Base Control Console
101
All Controls Inoperative from Platform Control Console
102
No up Function from Platform Controls (ANSI/CSA, CE, and AS)
105
No up Function from Platform Controls (KC)
106
10 No down Function from Platform Controls
108
11 Right Steer Inoperative
109
12 Left Steer Inoperative
109
13 Forward Drive Function Inoperative
110
14 Reverse Drive Function Inoperative
111
15 No Drive or Steer When Platform Elevated
113
16 High/Low Torque Inoperative
113
17 Pressure Transducer PT1 Inoperative
114
18 Angle Transducers AT1 And/Or AT2 Inoperative
115
19 Power Deck Inoperative (if Option Is Installed)
115
Hydraulic System
117
All Functions Inoperative
117
All System Sluggish
117
Platform Drifts down
117
Platform Lifts Slowly
117
Platform Does Not Lift
117
Platform will Not Lower
118
Platform Drives Slow
118
Platform will Not Drive in Forward or Reverse
118
Brake(S) will Not Release (Pin Brakes)
118
10 Brake(S) will Not Release (Wet Brakes)
119
11 MEWP will Not Hold on a Grade (Wet Brakes)
119
12 Platform Does Not Steer
119
13 High/Low Torque Inoperative
119
14 Platform Power Deck Inoperative (if Option Installed)
119
Section 5 - Procedures
120
General
120
Safety and Workmanship
120
Platform
121
Single Axis Joystick
121
Gate Spring Hinge Adjustment
122
Railing Maintenance and Repair
122
Base
123
System Relief Pressure Adjustment
123
Pothole Compression Rod Replacement
124
Pothole Limit Switches (LS1 & LS2) Replacement and Adjustment
125
Pothole Bar Replacement/Removal for Servicing
127
Tightening and Torque Recommendations for Hydraulic Couplings and Hoses
129
Integrated Hub Wheel Removal and Installation
131
Battery Maintenance
135
Charger Maintenance
135
Skycoded Module
142
Skycoded Control Module (CM1)
142
Calibration and Diagnostic Tool Key Functions
145
Diagnostics, Help Messages and Flash Codes
160
Override Mode Procedure
167
Initial Set-Up and Change Defaults Procedure
167
Access Levels Procedure
168
Calibrate Level Procedure
168
Calibrate Load Procedure
169
Language Setting Procedure
171
Other manuals for Skyjack SJ4726
Operation Manual
114 pages
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Skyjack SJ4726 Specifications
General
Brand
Skyjack
Model
SJ4726
Category
Scissor Lifts
Language
English
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