Protech PROX-1750 Service Manual

Service & Maintenance ManualModels3369LE4069LEM3369M40693121122July 23, 2012

SECTION 1 - SPECIFICATIONS1-2 – JLG Lift – 31211221.2 CAPACITIES 1.3 PRESSURE SETTINGS 1.4 COMPONENT DATABattery ChargerInput 220 VAC, 50 HZ Input, (1

SECTION 5 - JLG CONTROL SYSTEM5-4 – JLG Lift– 3121122Adjusting Parameters Using the Hand Held AnalyzerOnce you have gained access to level 1, and a pe

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-5NOTE: Refer to Table 5-3, Machine Model Adjustment, andTable 5-4, Machine Configuration Programm

SECTION 5 - JLG CONTROL SYSTEM5-6 – JLG Lift– 31211225.3 FLASH CODES/DTC’S AND DESCRIPTIONSNOTE: Machines with software prior to P1.0 will display the

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-72-1 210 POWER UP211 POWER CYCLEA new system power up has occurred since the last help message.21

SECTION 5 - JLG CONTROL SYSTEM5-8 – JLG Lift– 31211222-5 250 FUNCTION PREVENTED251 ELEV ANGLE SESOR FAULTY - VOLTAGE OUT OF RANGEThe sensor signal inp

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-94-4 440 BATTERY SUPPLY441 BATTERY VOLTAGE TOO LOW - SYSTEM SHUTDOWNRecharge batteries or check f

SECTION 5 - JLG CONTROL SYSTEM5-10 – JLG Lift– 3121122Table 5-2. Power Module Diagnostic LED Flash CodesFlash Code FaultConstant Illumination No Fault

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-11(Press Escape Twice to Return to Help)**(Test in Ground Mode)***(Test in Platform Mode)*(Outrig

SECTION 5 - JLG CONTROL SYSTEM5-12 – JLG Lift– 3121122BY PRESSING THESE ARROW KEYS ( ) YOU CAN SCROLL THROUGH THE TOP LEVEL MENUS. - To

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-13- Top Level Menu- Sub Level Menu- Item to be Viewed or ChangedBY PRESSING THESE ARROW KEYS (

SECTION 1 - SPECIFICATIONS3121122 – JLG Lift – 1-31.6 LUBRICATION NOTE: Hydraulic oils must have anti-wear qualities at leastto API Service Classifica

SECTION 5 - JLG CONTROL SYSTEM5-14 – JLG Lift– 3121122(Press Escape Twice to Return to Help)**(Test in Ground Mode)***(Test in Platform Mode)*(Outrigg

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-15BY PRESSING THESE ARROW KEYS ( ) YOU CAN SCROLL THROUGH THE TOP LEVEL MENUS. - T

SECTION 5 - JLG CONTROL SYSTEM5-16 – JLG Lift– 3121122- Top Level Menu- Sub Level Menu- Item to be Viewed or ChangedBY PRESSING THESE ARROW KEYS (

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-17NOTE: These settings may change in order to achieve optimal performance on a machine by machine

SECTION 5 - JLG CONTROL SYSTEM5-18 – JLG Lift– 3121122NOTE: When configuring an LE scissors machine, the machine configuration must be completed befor

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-195.4 GROUND CONTROL CIRCUIT BOARDSoftware Version 13.6 Table 5-5. J1 ConnectorPIN TAGNAME FUNCTI

SECTION 5 - JLG CONTROL SYSTEM5-20 – JLG Lift– 3121122Table 5-6. J2 ConnectorPIN TAGNAME FUNCTION TYPE1 B+ Control System Supply (+48V) POWER INPUT2 G

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-2137 4WAF 4 Wheel Assist Forward Solenoid Valve DIGITAL OUTPUT38 4AWR 4 Wheel Assist Reverse Sole

SECTION 5 - JLG CONTROL SYSTEM5-22 – JLG Lift– 3121122Table 5-8. J4 ConnectorPIN TAGNAME FUNCTION TYPE1 12V 12V Sensor Supply POWER OUTPUT2 TILTX X-Ax

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-23Software Version P1.0 Table 5-11. J1 ConnectorPIN TAGNAME FUNCTION TYPE1 PLTS Platform Select

SECTION 1 - SPECIFICATIONS1-4 – JLG Lift – 31211221.10 LUBRICATION TO AVOID PERSONAL INJURY, USE SAFETY PROP FOR ALLMAINTENANCE REQUIRING PLATFORM T

SECTION 5 - JLG CONTROL SYSTEM5-24 – JLG Lift– 3121122Table 5-12. J2 ConnectorPIN TAGNAME FUNCTION TYPE1 B+ Control System Supply (+48V) POWER INPUT2

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-2538 4AWR 4 Wheel Assist Reverse Solenoid Valve DIGITAL OUTPUT39 OSAX Oscillating Axle Solenoid V

SECTION 5 - JLG CONTROL SYSTEM5-26 – JLG Lift– 3121122Table 5-14. J4 ConnectorPIN TAGNAME FUNCTION TYPE1 12V 12V Sensor Supply POWER OUTPUT2 TILTX X-A

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-1SECTION 6. GENERAL ELECTRICAL INFORMATION & SCHEMATICS6.1 GENE

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-2 – JLG Lift – 3121122 Voltage Measurement Resistance MeasurementFigure 6-1. Voltage M

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-3 Continuity Measurement Current MeasurementFigure 6-3. Continuity

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-4 – JLG Lift – 3121122Continuity Measurement Over Long DistancesWhen trying to determine

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-56.3 APPLYING SILICONE DIELECTRIC COMPOUND TO AMP CONNECTORSSilicone

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-6 – JLG Lift – 3121122AssemblyCheck to be sure the wedge lock is in the open, or as-shipp

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-7Figure 6-8. Connector Assembly (3 of 4)Figure 6-9. Connector Asse

SECTION 1 - SPECIFICATIONS3121122 – JLG Lift – 1-51.11 SERIAL NUMBER LOCATIONSFor machine identification, a serial number plate is affixed to the fron

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-8 – JLG Lift – 3121122Disassembly5. Insert a 4.8 mm (3/16”) wide screwdriver blade betwee

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-9Service - Voltage ReadingDO NOT PIERCE WIRE INSULATION TO TAKE VOLT

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-10 – JLG Lift – 31211226.4 WORKING WITH DEUTSCH CONNECTORSDT/DTP Series AssemblyFigure 6-

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-1110. Push contact straight into connector grommet until a positive

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-12 – JLG Lift – 3121122Electrical Components InstallationF2PUMP/MOTORDRIVECONTROLLERLEFTD

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-13OSCILLATINGAXLECYLINDERSPROXIMITY SENSORSWITCH (USA BUILTMACHINES

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-14 – JLG Lift – 3121122GROUNDCONTROLBOXTOGENERATORMODULE(M3369 & M4069)BEACONLIGHTVAL

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-15DRIVECONTROLLERCIRCUITBREAKERRECEPTACLEAT PLATFORMDRIVECONTACTORPL

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-16 – JLG Lift – 31211221870130_GSht. 1 of 2Figure 6-22. Electrical Schematic - Sheet 1 o

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-171870130_GSht. 1 of 2Figure 6-23. Electrical Schematic - Sheet 1 o

SECTION 1 - SPECIFICATIONS1-6 – JLG Lift – 31211221.12 TORQUE CHARTSFigure 1-3. Torque Chart (SAE Fasteners - Sheet 1 of 7)REFERENCE JLG ANEROBIC THR

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-18 – JLG Lift – 31211221870130_GSht. 2 of 2Figure 6-24. Electrical Schematic - Kubota Ge

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-191870130_GSht. 2 of 2Figure 6-25. Electrical Schematic - Kubota Ge

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-20 – JLG Lift – 3121122Electrical Schematic - Yanmar Engine - 0270787 RevF0270787_FFigure

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-21This Page Intentionally Left Blank.

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-22 – JLG Lift – 3121122Hydraulic Diagram - 2792443 RevE2792443_EFigure 6-27. Hydraulic D

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-23Hydraulic Diagram - 2792444 RevG2792444_GFigure 6-28. Hydraulic D

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-24 – JLG Lift – 3121122Hydraulic Diagram - 2792445 RevF2792445_FFigure 6-29. Hydraulic D

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS3121122 – JLG Lift – 6-25Hydraulic Diagram - 2792446 RevH2792446_HFigure 6-30. Hydraulic D

SECTION 6 - GENERAL ELECTRICAL INFORMATION & SCHEMATICS6-26 – JLG Lift – 3121122Hydraulic Schematic - 2792442 RevF2792442_FFigure 6-31. Hydraulic

SECTION 1 - SPECIFICATIONS3121122 – JLG Lift – 1-7Figure 1-4. Torque Chart (SAE Fasteners - Sheet 2 of 7))Size TPI Bolt DiaTensile Stress AreaClamp L

Corporate OfficeJLG Industries, Inc.1 JLG DriveMcConnellsburg PA. 17233-9533USA (717) 485-5161 (717) 485-6417JLG Worldwide LocationsJLG Industries (

SECTION 1 - SPECIFICATIONS1-8 – JLG Lift – 3121122Figure 1-5. Torque Chart (SAE Fasteners - Sheet 3 of 7)Size TPI Bolt DiaTensile Stress AreaClamp Lo

SECTION 1 - SPECIFICATIONS3121122 – JLG Lift – 1-9Figure 1-6. Torque Chart (SAE Fasteners - Sheet 4 of 7)Size TPI Bolt DiaTensile Stress AreaClamp Lo

SECTION 1 - SPECIFICATIONS1-10 – JLG Lift – 3121122Figure 1-7. Torque Chart (METRIC Fasteners - Sheet 5 of 7))Size PITCHTensile Stress AreaClamp Load

SECTION 1 - SPECIFICATIONS3121122 – JLG Lift – 1-11Figure 1-8. Torque Chart (METRIC Fasteners - Sheet 6 of 7)Size PITCHTensile Stress AreaClamp LoadT

SECTION 1 - SPECIFICATIONS1-12 – JLG Lift – 3121122Figure 1-9. Torque Chart (METRIC Fasteners - Sheet 7 of 7)Size PITCHTensile Stress AreaClamp Load

SECTION 2 - GENERAL3121122 – JLG Lift – 2-1SECTION 2. GENERAL2.1 MACHINE PREPARATION, INSPECTION, AND MAINTENANCEGeneralThis section provides the nec

SECTION 2 - GENERAL2-2 – JLG Lift– 31211222.2 SERVICE AND GUIDELINESGeneralThe following information is provided to assist you in theuse and applicati

SECTION 2 - GENERAL3121122 – JLG Lift – 2-3Always recheck your work to assure that nothing has beenoverlooked. Do not make any adjustments, other than

SECTION 2 - GENERAL2-4 – JLG Lift– 31211222.3 LUBRICATION AND INFORMATIONHydraulic System1. The primary enemy of a hydraulic system is contam-ination.

SECTION 2 - GENERAL3121122 – JLG Lift – 2-52.4 CYLINDER DRIFT TESTMaximum acceptable cylinder drift is to be measuredusing the following methods.Platf

SECTION 2 - GENERAL2-6 – JLG Lift– 31211222.6 PREVENTIVE MAINTENANCE AND INSPECTION SCHEDULEThe preventive maintenance and inspection checks arelisted

SECTION 2 - GENERAL3121122 – JLG Lift – 2-7NOTE: If function speeds are slow on a fully chargedmachine a clogged filter may be indicated. Changefilter

SECTION 2 - GENERAL2-8 – JLG Lift– 3121122NOTES:

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-1SECTION 3. CHASSIS & SCISSOR ARMS3.1 CALIBRATIONSElevation Sensor Calibration(Prior

INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONS3121122 – JLG Lift – aSECTION A. INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONSA.A GENERALThis section co

SECTION 3 - CHASSIS & SCISSOR ARMS3-2 – JLG Lift – 312112213. Press ESCAPE, remove analyzer and assure allhardware is tight.Elevation Sensor Calib

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-3b. Tilt sensor mounting on machine or wedgedcrooked in control box:If the machine mounti

SECTION 3 - CHASSIS & SCISSOR ARMS3-4 – JLG Lift – 31211223.2 TILT SENSORTilt Sensor, JLG P/N 4000006: Tilt Sensor Removal:NOTE: Refer to Figure 3

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-5Tilt Sensor, JLG P/N 4000021:NOTE: Refer to Figure 3-4., Tilt Sensor Removal for num-ber

SECTION 3 - CHASSIS & SCISSOR ARMS3-6 – JLG Lift – 31211223.3 BATTERY MAINTENANCE AND CHARGINGIF REPLACING A BATTERY, EACH NEW BATTERY MUST WEIGHA

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-72. To charge the batteries, connect the charger to a230 volt source with a 15 amp minimu

SECTION 3 - CHASSIS & SCISSOR ARMS3-8 – JLG Lift – 3121122Battery Charger MaintenanceUSE CHARGER ONLY ON BATTERY SYSTEMS WITH AN ALGO-RITHM SELECT

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-9Battery Charger TroubleshootingNo Lights at allNo lights at all indicate that AC power t

SECTION 3 - CHASSIS & SCISSOR ARMS3-10 – JLG Lift – 3121122[5 Flashes] - Over TemperatureThis fault indicates the charger has become too hot durin

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-11Checking - Changing the Battery Charger Algo-rithmThe charger is pre-loaded with progra

INTRODUCTION - MAINTENANCE SAFETY PRECAUTIONSb – JLG Lift – 3121122REVISION LOGOriginal Issue - February 5, 2001 Revision - April 25, 2001 Revision -

SECTION 3 - CHASSIS & SCISSOR ARMS3-12 – JLG Lift – 3121122Removing the Battery BoxTo remove the battery box, perform the following steps.1. Pull

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-133.4 GENERATORNOTE: Throughout the Generator section, the abbreviationsRBS and CTS are u

SECTION 3 - CHASSIS & SCISSOR ARMS3-14 – JLG Lift – 3121122Figure 3-9. Generator Components

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-15Timing SequencesNOTE: Throughout the Generator section, the abbreviationsRBS and CTS ar

SECTION 3 - CHASSIS & SCISSOR ARMS3-16 – JLG Lift – 3121122 Figure 3-10. Generator System Analyzer Flow Chart

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-17To Connect the JLG Control System Analyzer to the Generator The JLG Control System Ana

SECTION 3 - CHASSIS & SCISSOR ARMS3-18 – JLG Lift – 3121122•UnderspeedEnabled once TDBP (time delay bypass) period haselapsed after engine startup

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-19b. The engine/camshaft rotation is not opening theinjection fuel pump. Using the recoil

SECTION 3 - CHASSIS & SCISSOR ARMS3-20 – JLG Lift – 31211224. Cut and remove the Wire Ties holding the Harnesslabel to the harness. Next, remove t

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-213.6 JOYSTICK CONTROLLER Figure 3-11. Joystick Controller - (JLG P/N 1600308)Table 3-9

3121122 – JLG Lift – i TABLE OF CONTENTSTABLE OF CONTENTSSUBJECT - SECTION, PARAGRAPH PAGE NO.SECTION A - INTRODUCTION - MAINTENANCE SA

SECTION 3 - CHASSIS & SCISSOR ARMS3-22 – JLG Lift – 3121122Figure 3-12. Joystick Controller - (JLG P/N 1600403)Table 3-11. Joystick Specification

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-23Figure 3-13. Drive Components

SECTION 3 - CHASSIS & SCISSOR ARMS3-24 – JLG Lift – 3121122Power Controller 3.7 TOWINGDisengaging for TowingPRIOR TO OPERATING THE DISCONNECT THE

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-254. Press the cover sufficiently against the shift rod toinsert the bolts at least 2 to

SECTION 3 - CHASSIS & SCISSOR ARMS3-26 – JLG Lift – 3121122Figure 3-15. Torque Hub

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-273.8 DRIVE HUB The final drive consists of two stages with an integrateddisconnect mecha

SECTION 3 - CHASSIS & SCISSOR ARMS3-28 – JLG Lift – 31211221. Retaining Screws2. Washers3. Pressure Plate4. Case Seal5. O-ring6. Back-up Ring7. Pi

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-293.9 DRIVE BRAKE - MICODisassembly1. After removing the brake from its installation, pla

SECTION 3 - CHASSIS & SCISSOR ARMS3-30 – JLG Lift – 31211223.10 TORQUE HUB 1. Spindle2. Lip Seal3. Tapered Bearing Cone4. Tapered Bearing Cup5. Ta

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-31Roll TestThe purpose of the roll test is to determine if the unit’sgears are rotating f

ii – JLG Lift – 3121122TABLE OF CONTENTS (Continued) 4.14 Cylinder Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3 - CHASSIS & SCISSOR ARMS3-32 – JLG Lift – 3121122Main Disassembly 1. Coupling2. Retaining Ring3. Ring Gear4. Cover Subassembly5. Washer

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-33Disassembly Instructions:1. Perform the Roll Check and Leak Check, if applica-ble prior

SECTION 3 - CHASSIS & SCISSOR ARMS3-34 – JLG Lift – 3121122Output Carrier Disassembly 1. Using a 1/8" diameter punch, drive the Roll Pin (1)i

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-35Input Carrier Disassembly 1. Using a 1/8" diameter punch, drive the Roll Pin (1)in

SECTION 3 - CHASSIS & SCISSOR ARMS3-36 – JLG Lift – 3121122Hub-Spindle Disassembly 1. Place unit on bench with Spindle (1) end down.2. Remove Reta

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-37Cover Disassembly 1. Remove O-ring (1) from the groove in the Cover (2).2. Remove the T

SECTION 3 - CHASSIS & SCISSOR ARMS3-38 – JLG Lift – 3121122Input Carrier Sub-Assembly 1. Apply a liberal coat of grease to the bore of oneInput Pl

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-39Output Carrier Sub-Assembly 1. Apply a liberal coat of grease to the bore of one Out-pu

SECTION 3 - CHASSIS & SCISSOR ARMS3-40 – JLG Lift – 3121122Hub-Spindle Sub-Assembly NOTE: Apply a light coat of oil on all component parts dur-in

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-41Cover Sub-Assembly 1. Grease O-Ring (7) and insert groove in Cover (2).2. Assemble Dis

3121122 – JLG Lift – iii TABLE OF CONTENTS3-25. Cover Sub-Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SECTION 3 - CHASSIS & SCISSOR ARMS3-42 – JLG Lift – 3121122Main Assembly1. Coupling2. Retaining Ring3. Ring Gear4. Cover Subassembly5. Washer6. Fi

SECTION 3 - CHASSIS & SCISSOR ARMS3121122 – JLG Lift – 3-43NOTE: All components should receive a generous amountof lubricant oil as they are being

SECTION 3 - CHASSIS & SCISSOR ARMS3-44 – JLG Lift – 3121122NOTES:

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-1SECTION 4. HYDRAULICS4.1 SERVICING AND MAINTENANCE GUIDELINESGeneralThe following information is provid

SECTION 4 - HYDRAULICS4-2 – JLG Lift – 31211222. Unless specific torque requirements are given withinthe text, standard torque values should be used o

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-33. While the unit is shut down, a good preventive main-tenance measure is to make a thorough inspectiono

SECTION 4 - HYDRAULICS4-4 – JLG Lift – 3121122selected, remaining until a function switch and both direc-tions are no longer selected.When the control

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-5lines. Carefully remove hydraulic hoses from appro-priate cylinder port block.4. There will be initial w

SECTION 4 - HYDRAULICS4-6 – JLG Lift – 31211224.11 CYLINDER REPAIRNOTE: The following are general procedures that apply toall of the cylinders on this

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-7Cleaning and Inspection1. Clean all parts thoroughly in an approved cleaningsolvent.2. Inspect the cylin

iv – JLG Lift – 3121122TABLE OF CONTENTS (Continued) 6-28. Hydraulic Diagram - 3369LE and M3369 (Oscillating Axle) . . . . . . . . . . . . . . .

SECTION 4 - HYDRAULICS4-8 – JLG Lift – 31211222. Using a soft mallet, tap a new wiper seal into theapplicable cylinder head gland groove. Install a ne

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-9EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THECYLINDER ROD, HEAD, AND PISTON. AVOID PULLING THE RODOFF

SECTION 4 - HYDRAULICS4-10 – JLG Lift – 312112227. If applicable, install the cartridge type holding valveand fittings in the rod port block using new

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-11Oscillating Axle Lockout Test (If Equipped)LOCKOUT SYSTEM TEST MUST BE PERFORMED QUARTERLY,ANY TIME A S

SECTION 4 - HYDRAULICS4-12 – JLG Lift – 31211224.14 CYLINDER ASSEMBLIES NOTE: Torque Locknut (4) to 1125 - 1375 ft lbs (1525.3 -1864 Nm).• Approximate

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-13NOTE: Torque Locknut (4) to 1125 - 1375 ft lbs (1525.3 -1864 Nm).• Approximate cylinder dry weight = 22

SECTION 4 - HYDRAULICS4-14 – JLG Lift – 3121122 1. Jack Pad2. Lock Washers3. Round Head Hex Screws4. Snap Ring5. Rod Protector Plate6. Sna

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-15NOTE: Torque Locknut (8) to 400 ft lbs (542.3 Nm).Torque Counter Balance Valve (20) and Check Valve(21)

SECTION 4 - HYDRAULICS4-16 – JLG Lift – 3121122NOTE: Torque Locknut (8) to 400 ft lbs (542.3 Nm).Torque Counter Balance Valve (20) and Check Valve(21)

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-17NOTE: Torque Nut (12) to 400 ft lbs (542.3 Nm).Torque Locking Screw (17) to 100 in lbs (11.3 Nm).Torque

SECTION 1 - SPECIFICATIONS3121122 – JLG Lift – 1-1SECTION 1. SPECIFICATIONS1.1 SPECIFICATIONS Table 1-1. Operating SpecificationsDescription 3369LE/M

SECTION 4 - HYDRAULICS4-18 – JLG Lift – 3121122123456789101112Figure 4-16. Steer Cylinder1. Barrel2. Rod3. Guide4. Locknut5. Piston6. Piston Seal7. O

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-19NOTE: Torque Capscrews (3) to 30 ft lbs (41 Nm). TorqueThermal Relief Valve (22) to 20 - 25 ft lbs (27

SECTION 4 - HYDRAULICS4-20 – JLG Lift – 31211224.15 PRESSURE SETTING PROCEDURESMain Relief at Pump1. Install pressure gauge at port “MP” on control va

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-21 4.16 DRIVE TORQUE HUBDisassembly1. Loosen all cover bolts and drain oil from unit.2. Remove the cover

SECTION 4 - HYDRAULICS4-22 – JLG Lift – 3121122Assembly1. With the hub shaft sub-assembly resting on the shaftinstall internal gear. The spline of the

SECTION 4 - HYDRAULICS3121122 – JLG Lift – 4-234.17 DRIVE ASSIST VALVE 1L 2L 1R2RMPLPLPRMPRT1 TVALVE SCHEMATICPRTPL2RMPL1RT11LMPR2LFigure 4-19. Drive

SECTION 4 - HYDRAULICS4-24 – JLG Lift – 3121122NOTES:

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-1SECTION 5. JLG CONTROL SYSTEM5.1 HAND HELD ANALYZER To Connect the Hand Held Analyzer: 1. Conne

SECTION 5 - JLG CONTROL SYSTEM5-2 – JLG Lift– 3121122Using the Analyzer:With the machine power on and the analyzer connectedproperly, the analyzer wil

SECTION 5 - JLG CONTROL SYSTEM3121122 – JLG Lift – 5-3while in access level 2. Remember, you may always can-cel a selected menu item by pressing the E