Name: Skyjack SJ9253 RT
Brand: Skyjack
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SERVICE

MANUAL

ROUGH TERRAIN SCISSORS

229046ACA

January 2021

ANSI/CSA, CE, AS, KC

SJ9233 RT, SJ9243 RT,

SJ9253 RT, SJ9664 RT

To order go to Discount-Equipment.com

Table of Contents5
Section 1 - Scheduled Maintenance10
Read and Heed10
Mobile Elevating Work Platform (MEWP) Definition10
Purpose of Equipment10
Use of Equipment10
Service Policy and Warranty10
Ownership of MEWP10
Optional Equipment10
Maintenance and Inspection Schedule11
Owner's Annual Inspection Record11
Replacement Parts11
Maintenance and Service Safety Tips11
Hydraulic System & Component Maintenance and Repair12
Maintenance Hints13
About this Section14
Owner's Annual Inspection Record15
Frequent/Periodic/Annual/Pre-Delivery Inspection Checklist16
General Inspections17
Service Bulletins17
Annual Inspection17
Labels17
Limit Switches17
Base/Engine18
Scissors Inspection23
Platform Inspections26
Function Tests27
Section 2 - Maintenance Tables and Diagrams28
Standard Hose Numbering System28
Torque Specifications for Fasteners (US Imperial)30
Torque Specifications for Fasteners (Metric)31
Torque Specifications for Hydraulic Couplings & Hoses32
Axle Torque Specifications33
Axle Maintenance Intervals34
Specifications - SJ9253 RT, SJ9243 RT, SJ9253 RT35
Specifications - SJ9664 RT36
Fluids37
Environment37
Floor Loading Pressure38
Maximum Platform Capacities (Evenly Distributed)39
Section 3 - System Component Identification and Schematics40
Electrical Symbol Chart41
Hydraulic Symbol Chart42
Wire Number and Color Code43
Hydraulic Parts List44
Electrical Parts List47
Drive Manifold - Hose Port Identification49
Drive Manifold - Hydraulic & Electrical Component Identification50
Auxiliary Manifold - Hose Port Identification51
Auxiliary Manifold - Hydraulic & Electrical Component Identification52
Outrigger Manifold53
Pressure Reducing & Motor Shift Manifolds54
Outrigger Manifold Harness55
Drive Manifold Harness56
Drive Manifold Harness Schematic57
Kubota D1305 Engine Harness58
Kubota D1305 Engine Harness Schematic59
Kubota WG972 Engine Harness60
Kubota WG972 Engine Harness Schematic61
Fuel Pump Harness62
ECU Power Harness63
Pressure Transducer Harness - SJ9233 RT, SJ9243 RT, SJ9253 RT64
Outrigger Control Harness65
Outrigger Terminal Strip66
Machine Controller Harness - SJ9233 RT, SJ9243 RT, SJ9253 RT67
Machine Controller Harness - Wiring Diagram - SJ9233 RT, SJ9243 RT, SJ9253 RT68
Machine Controller Harness - SJ9664 RT69
Machine Controller Harness - Wiring Diagram - SJ9664 RT70
Base Control Cable71
Control Harness a72
Control Harness B73
Dual Holding Valve Harness - SJ9233 RT, SJ9243 RT, SJ9253 RT74
Holding Valve Harnesses - SJ9664 RT75
Angle Transducer/Beeper/Flashing Light Harness - SJ9664 RT76
Load Cell Module Harness - SJ9664 RT77
Load Cell Module Power Harness - SJ9664 RT78
Load Cell Module CAN Harness - SJ9664 RT79
Hydraulic Schematic - SJ9233 RT, SJ9243 RT, SJ9253 RT81
Hydraulic Schematic - SJ9664 RT82
Base Control Box Wiring - with Outriggers83
Base Control Box Wiring - no Outriggers84
Platform Control Box Wiring85
Electrical Schematic - no Options - SJ9233 RT, SJ9243 RT, SJ9253 RT86
Electrical Schematic - All Options - SJ9233 RT, SJ9243 RT, SJ9253 RT87
Electrical Schematic - no Options - SJ9664 RT88
Electrical Schematic - All Options - SJ9664 RT89
Engine Electrical Schematic - Kubota D130590
Engine Electrical Schematic - Kubota WG97291
Section 4 - Troubleshooting Information92
Introduction92
Electrical System93
All Controls Inoperative93
All Functions Inoperative from Base96
All Functions Inoperative from Platform98
Engine Does Not Crank from Platform (Kubota Diesel D1305)99
Engine Does Not Crank from Platform (Kubota Dual Fuel DG972)101
Engine Does Not Crank from Base Controls103
Glow Plugs Inoperative from Base (Kubota Diesel D1305)103
Glow Plugs Inoperative from Platform (Kubota Diesel D1305)104
Engine Cranks but Does Not Start (Kubota Diesel D1305)105
10 Engine Cranks but Does Not Start (Kubota Dual Fuel WG972)105
11 Drive and Steer Inoperative107
12 Brakes Do Not Release109
13 Steer Right Inoperative110
14 Steer Left Inoperative111
15 Reverse Drive Inoperative113
16 Forward Drive Inoperative115
17 High Speed/High Torque/Hill Climb Range Inoperative117
18 Differential Lock will Not Engage118
19 Lift (Up) Circuit Inoperative from Platform (no Outriggers)119
20 Lift (Up) Circuit Inoperative from Platform When Using Outriggers121
21 Lift (Up) Circuit Inoperative from Platform with Outriggers Retracted124
22 Lift (Up) Circuit Inoperative from Base125
23 Lower (Down) Circuit Inoperative from Platform127
24 Down Circuit Inoperative from Base129
25 Belt Driven 3.5Kw Generator Inoperative (if Equipped)130
26 Hydraulic 7.5Kw Generator Inoperative (if Equipped)130
27 Hydraulic 7.5Kw Generator Does Not Shut off from Generator Switch (if Equipped)132
28 Left Rear Outrigger Inoperative Manually133
29 Right Rear Outrigger Inoperative Manually134
30 Right Front Outriggers Inoperative Manually136
31 Left Front Outriggers Inoperative Manually138
32 Pressure Transducer PT1 Inoperative - SJ9233/43/53 RT140
33 Load Cell Interface Inoperative - SJ9664 RT140
34 Angle Transducer AT1 Inoperative141
Hydraulic System142
4.2-1 All Functions Inoperative142
Steering Inoperative142
Drive Inoperative142
Reverse Drive Inoperative143
Forward Drive Inoperative143
Brakes will Not Release143
Brakes will Not Engage144
Differential Lock will Not Engage144
2-Speed Motor will Not Engage - SJ9233/43/53 RT144
10 2-Speed Motor will Not Engage - SJ9664 RT144
11 Lift (Up) Circuit Inoperative - SJ9233/43/53 RT145
12 Lift (Up) Circuit Inoperative - SJ9664 RT145
13 Lower (Down) Circuit Inoperative146
14 Hydraulic 7.5Kw Generator Inoperative (if Equipped)146
15 All Outriggers Inoperative146
16 Left Front Outrigger Inoperative146
17 Right Front Outrigger Inoperative147
18 Right Rear Outrigger Inoperative147
19 Left Rear Outrigger Inoperative147
20 Outrigger(S) Drift down - SJ9233/43/53 RT148
21 Outrigger(S) Drift down - SJ9664 RT148
Section 5 - Procedures149
General149
Safety and Workmanship149
Base150
Changing the Hydraulic Oil150
Outrigger Lower Limit Switch Replacement and Adjustment151
Axles153
Wheel Bolt/Nut Inspection and Torquing Procedure153
Wheel Reinstallation and Torquing Procedure153
Change the Oil in the Axles154
Check the Oil Level in the Torque Hubs154
Change the Oil in the Torque Hubs154
Axle Grease Points155
Brake Inspection156
Release the Brakes Manually157
Winch and Tow the MEWP157
Engines159
Replace the Engine Oil and Filter159
Replace the Fuel Filter Element - Diesel160
Bleed the Fuel System of Air - Diesel161
Replace the Air Cleaner Element162
Check and Replenish the Radiator Coolant Level163
Drain and Refill the Radiator163
Fan Belt Replacement and Adjustment164
Belt-Driven Generator Belt Replacement165
Manifolds and Hydraulic Pumps166
System Pressure Test166
System Pressure Adjustment166
Load Sense Pressure Test167
Load Sense Pressure Adjustment167
Lift Pressure Test168
Lift Pressure Adjustment168
Brake Pressure Test169
Brake Pressure Adjustment169
Scissors170
Lower Lift Cylinder Removal and Replacement170
Upper Cylinder Removal and Replacement172
Platform174
Single Axis Joystick174
Gate Spring Hinge Adjustment175
Railing Maintenance and Repair175
Skycoded Module176
Machine Controller Module Pin Reference Chart176
Valve Driver Current Control Module (VCCM) Pin Reference Chart182
Terminal Board Module (TMB)184
Current Sensing Controller186
Calibration and Diagnostic Tool Key Functions187
Machine Controller Menu194
Diagnostics208
Help Messages and Flash Codes210
Access Level Procedure214
10 Override Mode Procedure214
11 Initial Set-Up and Change Defaults Procedure215
12 Calibration215

Brand	Skyjack
Model	SJ9253 RT
Category	Scissor Lifts
Language	English

Skyjack SJ9253 RT Service Manual

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