Straight off JLG's own press: document 3120816 is the 86-page JLG CM25RT, CM33RT, CM40RT Service and Maintenance Manual, here as a PDF covering all three sizzor lift models. Electrical diagrams close out the book, drawn separately for battery-powered, gasoline, and Deutz diesel machines, so a dead limit switch stops being a mystery. Troubleshooting tables for the platform elevation system, chassis, and electrical circuits fill the last third, and the torque hub procedures walk you through disassembly, roll testing, and leak testing. Swap the hydraulic filter element every 250 hours, spec it at 25 microns nominal, and fill the tank to 64.4 liters; the capacities chapter holds the rest. Guess a pressure setting wrong and you buy a pump. Bookmarked and searchable by keyword, this file lives wherever your lift does: shop bench, service truck, or rental yard.
What's Inside This JLG CM25RT, CM33RT, CM40RT Manual
| System | Pages | Key Topics |
|---|---|---|
| List of Illustrations | 6 | Serial Number Locations, Drive Motor, Electrical Diagrams |
| Specifications | 7-14 | Capacities, Component Data, Performance Data, Torque Requirements, Lubrication, Pressure Settings, Serial Number Locations, Limit Switches |
| General Maintenance Guidelines | 15-17 | Safety and Workmanship, Cleanliness, Component Removal and Installation, Hydraulic System Maintenance, Lubrication |
| Cylinder Theory and Repair | 18-22 | Cylinder Theory of Operation, Valve Theory, Cylinder Checking Procedures, Cylinder Removal and Installation, Cylinder Repair, Tilt Alarm Switch |
| Pressure Setting Procedures | 23-27 | Battery Powered Machine Pressure Settings, Gasoline/Diesel Engine Pressure Settings, Drive Pump Start-Up, Throttle Checks and Adjustments |
| Drive System and Axle Maintenance | 28-35 | Throttle Checks (Deutz), Oscillating Axle Lockout Cylinder Bleeding, Piston Drive Motor Disassembly, Battery Powered Drive Motor Maintenance |
| Torque Hub and Brake Procedures | 36-48 | Drive Torque Hub Disassembly, Roll Test, Leak Test, Drive Torque Hub/Brake 4WD Front, Drive Brake 2WD/4WD Rear |
| Fuel Systems and Maintenance Schedules | 49-52 | Dual Fuel/Lpg System, Freewheeling Feature, Preventive Maintenance and Inspection Schedule |
| Troubleshooting | 53-86 | General, Platform Elevation System Troubleshooting, Chassis Troubleshooting, Electrical System Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Hydraulic Filter - Nominal Micron Rating | 25 Microns | p. 7 |
| Hydraulic Filter Element Replacement Interval | 250 hours | p. 11 |
| Hydraulic Oil Tank Capacity | 64.4 liters | p. 7 |
| Fuel Tank Capacity | 56.8 liters | p. 7 |
| Gasoline Engine Oil Capacity (w/filter) | 3.2 liters | p. 7 |
| Diesel Engine Oil Capacity (w/filter) | 6.5 liters | p. 7 |
| CM25RT | ||
| Platform Capacity (CM25RT) | 900 kg | p. 7 |
| CM33RT | ||
| Platform Capacity (CM33RT) | 680 kg | p. 7 |
| CM40RT | ||
| Platform Capacity (CM40RT) | 450 kg | p. 7 |
JLG CM25RT, CM33RT, CM40RT Common Problems This Manual Covers
JLG CM25RT scissor lift platform won't raise, drifts down under load with weak hydraulic response
Check hydraulic oil level; the tank holds 64.4 liters. Inspect hoses and fittings for external leaks, then work the platform elevation troubleshooting chart starting on page 54 for a stuck-open main relief valve or scored valve spool. Test cylinders for internal leakage using the cylinder checking procedures that begin on page 18.
Manual Section: Platform Elevation System Troubleshooting p. 54Hydraulic pump noisy or cavitating, platform raises and lowers erratically with jerky slow motion
Check for a plugged suction strainer or dirty filter first. Replace the hydraulic filter element, rated 25 microns, every 250 hours per the maintenance schedule on page 11. Top off the 64.4 liter tank, cycle all functions to purge air, then follow the hydraulic troubleshooting steps in the section beginning on page 53.
Manual Section: Hydraulic System TroubleshootingEngine will not crank or cranks slowly, battery dead again by morning
Test the 12 V battery under load and clean both cable terminals before condemning the starter. Trace the crank circuit against the wiring diagram on page 66, checking interlock and neutral switches for continuity. Follow the engine starter system checks in the troubleshooting section that begins on page 53.
Manual Section: Electrical System Troubleshooting - Engine Starter SystemMachine will not drive forward or reverse after towing, freewheeling, or hub service
Verify the torque hub disconnect is re-engaged if the machine was freewheeled for towing; the freewheeling feature is described with the maintenance schedules starting on page 49. Perform the roll test and leak test in the torque hub procedures beginning on page 36, then confirm 12 V reaches the drive solenoid coil with the controller in forward.
Manual Section: Torque Hub and Brake Procedures p. 36Frequently Asked Questions
What are the torque specifications for JLG CM25RT wheel nuts?
The torque specification for wheel lugs on the JLG CM25RT is 12 kgm. This should be checked at an interval of 50 hours. p. 8
What are the hydraulic filter replacement specifications for the JLG CM25RT, CM33RT, CM40RT scissor lift?
JLG Industries recommends replacing the hydraulic filter element after the first 40 hours of operation and every 250 hours thereafter. p. 11
What is the hydraulic oil tank capacity for the JLG CM25RT, CM33RT, and CM40RT?
The hydraulic oil tank has a capacity of approximately 64.4 liters, which includes 15% air space. p. 7
What is the procedure for bleeding the oscillating axle lockout cylinder?
To bleed the cylinder, place a 20 cm high block in front of the left front wheel, drive the machine up the ramp, and with the engine at idle, crack open both fittings at the lockout cylinder one at a time until all air is dissipated. p. 29
What is the main relief pressure setting on JLG CM25RT, CM33RT, CM40RT gasoline or diesel engine models?
The main relief pressure setting for the gasoline and diesel engine models is 176 kg/cm². p. 8
How quickly can I access this JLG CM25RT manual after buying?
Instant PDF download. You get the full 86-page searchable Service and Maintenance Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print just the pages I need from this JLG CM25RT manual?
Printing is allowed without restriction. Pull the pages you need for the job and bin them when they get greasy.
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