Part of the New Holland Repair Manuals.
Pull the top cover off the Powershift gearbox in a New Holland M427 and you are into the hardest hundred pages of this book: clutch pack overhaul, modulation valve operation, and pressure testing for both the clutch circuit and the torque converter circuit. This service manual, New Holland publication 87755802D, covers the M427, M428 and M459 telehandlers and their F4GE9484F*J600 and F4GE9484J*J600 engines across 447 pages.
Beyond the gearbox it works through the engine, front and rear axles, power and parking brakes, the hydraulic system, and the electrical system with fuse layouts and general fault finding.
Every one of these jobs stalls at the same point: you need one torque figure or one test pressure, and the machine sits until you find it. The PDF is bookmarked by section, so the number you are missing is a few clicks away, not a call to the dealer.
What's Inside This New Holland M427, M428, M459 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 8-45 | Safety Rules, Product Identification, Environmental Considerations, Maintenance Techniques |
| Engine | 46-83 | Main Specifications of Engines, Troubleshooting (Generalities Engine F4GE9484F*J600/F4GE9484J*J600, Removal and Installation of the Motor and the Radiator, Special Tools) |
| Powershift Gearbox | 84-197 | Powershift Gearbox 4x4, Driving with the Powershift Gearbox, Gearbox Assembly, Idler Gear Case Assembly |
| Front Axle | 198-271 | Specifications, Description Front Axle Std Assy, Description Front Axle Lsd Assy, Operation, Troubleshooting, Wheel Toe-In Check, Component Overhaul, Front Axle Removal Procedure |
| Rear Axle | 272-285 | Specifications, Description, Operation Diagram, Component Overhaul, Rear Axle Removal Procedure, Overhaul, Special Tools |
| Brakes | 286-301 | Specifications, Power Brakes, Parking Brake, Brake Disc Adjustment, Troubleshooting, Brakes Disassembly |
| Hydraulic System | 302-399 | Technical Data |
| Electrical System | 400-447 | Electrical System General (Electrical Equipment Specifications, Electrical System and Fuses, Controls and Instruments, Powershift Gearbox 4x3, Switches, Lights, Protecting the Electrical Systems During Charging or Welding, Starting the Machine Using Jump Leads, Temporary Wiring Repairs, Electrical System-General Fault Finding) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Weight | 22700 lb (10300 kg) | p. 3 |
| Radiator cap | 14.5 psi (1 bar) | p. 38 |
| Securing screw, fuel pump | 25 ±5 Nm | p. 63 |
| Radiator Cap Pressure | 14.5 psi (1 bar) | p. 38 |
| Main Hydraulic System Pressure | 3625 psi (250 bar) | p. 40 |
| Steering System Pressure | 2538 psi (175 bar) | p. 40 |
| Wheel Nut Torque | 398 lb-ft (540 Nm) | p. 40 |
| Cab Securing Screw Torque | 280 lb-ft (380 Nm) | p. 40 |
| M427 | ||
| Engine Power (M427) | 101 hp (74 kw) | p. 3 |
| M428, M459 | ||
| Engine Power (M428/M459) | 120 hp (88 kw) | p. 3 |
| M427, M428 | ||
| Max. Lifting Height (M427/M428) | 41.8 ft (12.74 m) | p. 3 |
| M459 | ||
| Max. Lifting Height (M459) | 44.6 ft (13.60 m) | p. 3 |
New Holland M427, M428, M459 Common Problems This Manual Covers
Gearbox slips or shifts harshly under load
Worn clutch packs or low clutch circuit pressure show up first when the machine is loaded on a grade. The manual walks through pressure testing the clutch and high pressure circuit, modulation valve operation, and a complete gearbox overhaul.
Manual Section: Powershift Gearbox p. 84Boom slow to lift or losing power
A telehandler that struggles to lift at height usually has a pump or relief valve problem. The hydraulic section gives the technical data to test against, including the 3625 psi (250 bar) main system pressure.
Manual Section: Hydraulic System p. 302Brakes drag or pedal goes soft
Disc wear in the power brakes changes clearance over time and shows up as drag or a low pedal. The manual covers brake disc adjustment, parking brake service, troubleshooting, and full disassembly.
Manual Section: Brakes p. 286Front axle clunks or whines in turns
Wear in the limited slip differential or drive pinion makes itself heard on tight turns under load. This section covers troubleshooting, the wheel toe-in check, LSD disassembly, and pinion installation and adjustment.
Manual Section: Front Axle p. 198Engine overheats or is down on power
Cooling and fuel problems on the F4GE9484 engines are covered in a dedicated troubleshooting chapter, along with removal and installation of the engine and radiator and the special tools required.
Manual Section: Engine p. 46Electrical faults and repeated blown fuses
Intermittent electrical faults are the fastest way to lose a working day. The electrical section maps the fuses, switches and instruments, and includes general fault finding plus safe procedures for jump starting and welding on the machine.
Manual Section: Electrical System p. 400Rear axle leaks or howls
Seal leaks and bearing noise in the rear axle are common on high-hour machines. The manual gives the removal procedure, component overhaul steps, and the special tools list for the job.
Manual Section: Rear Axle p. 272Frequently Asked Questions
Which machines and engines does this manual cover?
It covers the New Holland M427, M428 and M459 telehandlers fitted with the F4GE9484F*J600 and F4GE9484J*J600 engines. That includes the 101 hp M427 and the 120 hp M428 and M459. p. 46
Does it cover the Powershift gearbox in detail?
Yes, the Powershift Gearbox section is the largest in the book. It covers gearbox operation, hydraulic circuit diagrams, modulation valve operation, pressure testing of the clutch and torque converter circuits, troubleshooting, and a step-by-step overhaul with special tools. p. 84
Can I trace electrical faults with this manual?
Yes. The Electrical System section covers equipment specifications, fuses, switches, controls and instruments, and general fault finding. It also includes procedures for protecting the electrical system during charging or welding, jump starting, and temporary wiring repairs. p. 400
How do I get the manual after purchase?
It is a direct digital download. After checkout you download the PDF file (about 111 MB) and it is yours to keep, with no shipping and no waiting.
How quickly can I access this New Holland M427 manual after buying?
This is a 447-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print this New Holland M427 manual?
Print away. There is no DRM and no page limit. Many buyers print one chapter at a time and leave the rest on a tablet.
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