Mitsubishi Forklift Chassis & Mast Service Manual – GP40N1 GP45N1 GP50N1 GP55N1 DP40NM1 DP55NM1

Description

Mitsubishi Forklift Chassis & Mast Service Manual – GP and DP Series

This is the complete chassis and mast service manual for Mitsubishi and CAT lift truck models GP40N1, GP45N1, GP50CN1, GP50N1, GP55N1, DP40NM1, DP45NM1, DP50CNM1, DP50NM1 and DP55NM1. Document number 99739-8B120. It covers the chassis and mast systems in full workshop detail: rear axle assembly, wheel hubs, king pins, steering cylinders, tie rods, dry and wet brake systems, parking brake valves, steering valve, hydraulic pump, MC and FC control valves, lift and tilt cylinders, and simplex, duplex and triplex masts with forks. Every procedure is written for the technician working on the machine, with removal and installation sequences, disassembly and reassembly steps, inspection limits and adjustment values.

File Details

• Manual type: Chassis & Mast Service Manual
• Brand: Mitsubishi / CAT Lift Trucks (Mitsubishi Logisnext Americas)
• Document number: 99739-8B120
• Models covered: GP40N1, GP45N1, GP50CN1, GP50N1, GP55N1, DP40NM1, DP45NM1, DP50CNM1, DP50NM1, DP55NM1
• Language: English
• Page count: 322 pages
• File format: PDF

Chapters Covered

• Chapter 8 – Rear Axle: structure and functions, rear axle in general, wheel hub components, king pin components, tie rod, steering cylinder; removal and installation of rear wheels and rear axle assembly; disassembly and reassembly of wheel hub, knuckle (king pin) and steering cylinder; troubleshooting; service data
• Chapter 9 – Brake System: dry type brake system, wet type brake system, wheel brakes for 4.0/4.5 ton and 5.0C/5.0/5.5 ton classes, parking brake valve, wet disc brake assembly, auto deceleration valve, wheel cylinder, inspection and adjustment, brake line bleeding, braking performance test, oil pressure measurement, parking brake emergency release, troubleshooting, service data
• Chapter 10 – Steering System: steering system structure and functions, steering valve, steering column, disassembly and reassembly of valves, hoses and pipes, steering wheel and steering valve, tilt lock lever, STC (Snap-To-Connect) connectors, troubleshooting, service data
• Chapter 11 – Hydraulic System: hydraulic circuit diagrams for MC and FC control valves, hydraulic tank, gear pump, MC control valve operation, FC control valve operation, flow regulator valve, down safety valve, simplex and duplex lift cylinders, first cylinder of duplex and triplex mast, tilt cylinder, disassembly and reassembly of hydraulic pump, lift cylinder, tilt cylinder, flow regulator valve, piping, suction strainer and return filter, inspection and adjustment, troubleshooting, service data
• Chapter 12 – Mast and Forks: simplex mast (dual panoramic 5V40C to 5V50C), duplex mast (dual full-free panoramic 5F40C to 5F50C), triplex mast (triple full-free panoramic 5M40C to 5M50C), mast operation, removal and installation, disassembly and reassembly, mast roller and strip replacement without removing the mast, inspection and adjustment, chain tension, chain elongation, fork service, troubleshooting, service data
• Chapter 13 – Service Data: maintenance schedule, tightening torque for standard bolts and nuts (metric fine and coarse thread), periodic inspection parts, lubrication instructions, fuel and lubricant specifications, adjustment values and oil quantities, LPG fuel quality, special service tools

This Mitsubishi forklift chassis and mast service manual gives a technician the full workshop procedure set for the GP40N1 to GP55N1 and DP40NM1 to DP55NM1 truck families. Rather than a generic overview, each chapter follows the same practical pattern: how the component is built and how it functions, the safe removal sequence, the disassembly and reassembly steps in order, the inspection points after teardown, the clearance and torque values needed at reassembly, and the fault-finding table when something does not behave correctly. The mast chapter alone spans simplex, duplex and triplex designs with the roller, shim, chain and strip adjustment figures printed for each. The brake chapter separates dry type and wet type systems because the service approach differs, and the hydraulic chapter covers both MC and FC control valve arrangements with circuit diagrams, port identification and the internal operation of priority, unload, bleed-off and relief valves. Service data tables at the end of each chapter give the standard values, service limits and tightening torques without needing to flip between documents.

What This Manual Lets You Do

• Remove and reinstall the rear axle assembly, wheel hubs, king pins, tie rod and steering cylinder on GP40N1, GP45N1, GP50CN1, GP50N1, GP55N1, DP40NM1, DP45NM1, DP50CNM1, DP50NM1 and DP55NM1 trucks
• Overhaul dry type wheel brakes for 4.0/4.5 ton and 5.0C/5.0/5.5 ton classes, including wheel cylinder rebuild, automatic adjuster test and manual shoe-to-drum adjustment
• Service the wet disc brake assembly, parking brake valve and wet type brake circuit, with air bleeding and flushing procedures
• Diagnose and repair steering problems through the steering valve, steering column, STC connectors and steering system relief valve
• Rebuild the hydraulic gear pump, lift cylinders, tilt cylinders, flow regulator valve and MC or FC control valve sections
• Set mast roller clearances, mast strip clearances, chain tension and chain elongation on simplex, duplex and triplex masts
• Adjust mast tilt angle and balance left and right lift cylinder stroke
• Look up the correct torque, clearance, service limit and pressure value instead of guessing

Why the Correct Procedure and Specs Matter

Forklift chassis and mast work is unforgiving. A wheel bearing preload that is set by feel instead of to the specified rotation starting torque, a king pin clearance that is left too wide, a mast roller shim count that is off by half a millimetre, or a brake shoe clearance that is set outside the printed range will all show up as premature wear, uneven braking, mast shake or a truck that fails inspection. This manual gives the measurement method and the acceptance value together, so the job can be checked rather than assumed. Critical safety items such as brake hoses, high-pressure hoses, power steering hoses and lift chains are also listed with their replacement intervals in the periodic inspection parts section.

Delivery

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The Mitsubishi forklift chassis and mast service manual is delivered as an instant PDF download after payment. There is no shipping and no waiting for a physical book. The file opens on a laptop, desktop, tablet or phone, and any page can be printed for use in the workshop. Keep it on the service truck, in the office or on the bench and pull up the exact procedure, diagram or torque table when the job is in front of you.