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Part of the New Holland Repair Manuals.
This 690-page New Holland T1510, T1520 Service Manual (OEM #84260810) puts the complete engine, hydrostatic transmission, and electrical system rebuild in your hands for both tractor models. Open it up and you get full wiring diagrams covering the safety controller, alternator, and starter circuits, plus hydraulic schematics for the variable displacement pump and control valve assembly. You also get a dedicated troubleshooting section and page after page of torque tables for clutch, brake, and axle work, right down to exploded views for parts identification. Torque the flywheel retaining cap screws to 69-78 N-m, and check single clutch disc thickness against a 3.2 mm spec with a 7.2 mm wear limit before you button it back up. No more flipping through a shop manual with grease on your hands trying to find the right page. Bookmarked by system, so you jump straight to hydrostatic transmission or electrical without scrolling, and it opens on your phone, tablet, or laptop right in the shop.
What's Inside This New Holland T1510, T1520 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 39-60 | Introduction, Precautionary Statements, Personal Safety, Machine Safety and Information, Safety, Tractor |
| Engine | 61-192 | Cylinder Head and Valve Train Components, Cylinder Block Assembly, Fuel Injector and Glow Plug, Timing Gears and Camshaft, Crankshaft and Main Bearings, Fuel System |
| Clutch | 193-216 | Single Clutch, Double Clutch, Clutch Pedal Assembly, Clutch Pilot Bearing, Clutch Release Bearing |
| Gear Transmission | 217-246 | 9 X 3 Gear Transmission, Transmission Assembly, Main Gear Shifter Rod, Main Shaft, Countershaft, FWD Drive Shaft |
| FWD Front Axle | 247-274 | Four Wheel Drive, Reduction Gear - Drop Box, Front Axle and Differential, Drive Pinion, Differential Gear, Front Wheel Toe-In |
| Differential, Rear Axle | 275-300 | Differential Assembly, Differential Lock, Drive Pinion, Rear Axle, Axle Seal |
| Hydrostatic Transmission | 301-336 | Variable Displacement Pump, Fixed Displacement Motor, Fluid Flow, Hydrostatic Unit, Hydrostatic Pump, Hydrostatic Motor |
| Power Take-Off Systems | 337-362 | Transmission Drive Power Take-Off, Live Power Take-Off, Output Shaft, Center Countershaft, Rear Countershaft, Mid-Mount PTO |
| Brakes | 363-368 | Rear Axle and Brakes, Brake Operation, Parking Brake, Brake Linkage Adjustment |
| Hydraulic System | 369-426 | Hydraulic Fluid Filter, Combination System Relief - Diverter Valve Manifold Assembly, Control Valve Assembly (Hpl), Hydraulic Pump, Remote Valves, Lift Cylinder |
| Steering | 427-480 | Power Steering System, Power Steering Control Motor, Power Steering Pump, Power Steering Cylinder, Power Steering Lines, Steering Column |
| Wheels, Tires and 2WD Axle | 481-498 | Two-Wheel Drive Components, Front Wheel Hub, Spindle, Front Axle - 2WD, Front Axle Pivot, Wheels and Tires - Tread Settings and Ballasting |
| Electrical System | 499-672 | Battery, Main Fuse (40 Amp), Fuse Block, Key Switch, Safety Controller, Alternator and Starter |
| Platform | 673-690 | Hood, Steering Wheel, Dash Panel, Seat, Roll Over Protection System (ROPS), Fuel Tank |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Flywheel Retaining Cap Screws Torque | 69 - 78 N·m (51 - 58 lb ft) | p. 74 |
| Brake Discs: Lining Groove Depth | 0.1 mm (0.004 in) | p. 364 |
| Brake Discs: Lining Groove Depth Allowable Limit | 0.0 mm (0.0 in) | p. 364 |
| HST Pump Trunnion Seal Installation Depth | 0.5 mm (0.0197 in) below trunnion counter bore | p. 324 |
| HST Port Block Oil Seal Installation Depth | 4 mm (0.157 in) below the port block surface | p. 329 |
| Hydraulic Pump Capacity | 23.3 L/min (6.2 US gal/min) | p. 372 |
| System Relief Valve Setting | 14700 ± 500 kPa (2133 ± 70 psi) | p. 372 |
| Differential Drive Pinion to Ring Gear Backlash Normal | 0.1 - 0.15 mm (0.004 - 0.006 in) | p. 276 |
| Differential Drive Pinion to Ring Gear Backlash Allowable Limit | 0.5 mm (0.020 in) | p. 276 |
| HST Models | ||
| Single Clutch Disc Thickness | 3.2 mm (0.1259 in) | p. 201 |
| Single Clutch Disc Thickness Allowable Limit | 7.2 mm (0.28 in) | p. 201 |
| T1520 | ||
| Engine Gross Horsepower | 26.0 kW (35.0 Hp) | p. 47 |
New Holland T1510, T1520 Common Problems This Manual Covers
New Holland T1510/T1520 brake pedal sinks near the floor before the brakes grab, holding poorly on a slope
Check brake pedal free play against the brakes section on page 364; correct travel is 35 to 45 mm (1.38 to 1.77 in). Pull the discs and measure the lining groove depth, replacing any disc worn to 0.1 mm (0.004 in) or less since the allowable limit is flush at 0.0 mm. Bleed the system after reassembly and recheck pedal travel before road testing.
Manual Section: Brakes p. 364Clutch slips or won't fully engage even with the pedal adjusted
Verify clutch pedal free travel first; the spec on page 49 calls for 19 to 30 mm (0.75 to 1.18 in) before the pedal meets resistance. If travel is correct but slip continues, pull the clutch cover and inspect the disc for glazing or oil contamination. Torque the mounting cap screws to 22.6 to 28.4 N·m (16.6 to 21 lb ft) per page 202 on reassembly, and replace the disc if lining is thin or scored.
Manual Section: Clutch p. 202Transmission hard shifting or grinding between gears under load
Split the housing per the gear transmission section starting on page 217 and inspect the shift forks, detent balls, and shifter rod grooves for wear before condemning the gears themselves. A worn detent spring or a scored shift rail groove will let the collar hang up between ratios even when the gear teeth are fine. Replace any fork showing visible slide-gear clearance and reseat the detent balls with fresh springs before buttoning up the case.
Manual Section: Gear Transmission p. 217Hydrostatic drive loses power or surges instead of holding a steady speed
Pressure-test the high pressure relief valve in the hydrostatic transmission section on page 330; it should hold at 27510 kPa (3990 psi) and a valve stuck open or seat worn will bleed off drive pressure under load. Drain and inspect the charge filter for debris before condemning the pump or motor. If pressure won't hold after the valve is cleaned and reseated, pull the pump for internal wear inspection.
Manual Section: Hydrostatic Transmission p. 330Loader or three-point implement lifts slowly or won't reach full height
Check hydraulic pump output against the spec on page 372; a healthy pump should deliver 23.3 L/min (6.2 US gal/min) at rated speed, and anything noticeably below that points to worn pump gears or a suction-side leak. Confirm the system relief valve is holding 14700 kPa plus or minus 500 kPa (2133 plus or minus 70 psi) rather than dumping early. Clean the fluid filter and recheck fluid level before pulling the pump for teardown.
Manual Section: Hydraulic System p. 372Frequently Asked Questions
What are the torque specifications for the flywheel bolts on a New Holland T1510 engine?
For the New Holland T1510 engine (Shibaura N843/N843L), the flywheel retaining cap screws should be torqued to 69 - 78 N·m (51 - 58 lb ft). p. 74
What are the torque specifications for the rear axle housing bolts connecting to the transmission on a New Holland T1520 4WD?
The rear axle housing should be secured to the transmission using five M10x25 cap screws, seven M10x80 cap screws, M10 nut, and M10 lock washer, torqued to 49 - 62.8 N·m (36.2 - 46.3 lb ft). p. 297
What are the replacement specifications for brake disc lining wear on New Holland T1510/T1520 tractors?
The brake discs have a lining groove depth of 0.1 mm (0.004 in) with an allowable limit of 0.0 mm (0.0 in). If the lining is worn to this limit, the brake discs should be replaced. p. 364
What are the replacement specifications for the clutch disc assembly on New Holland T1510/T1520 HST models?
The standard thickness of the clutch disc (AT free) is 3.2 mm (0.1259 in), with an allowable limit of 7.2 mm (0.28 in). The depth of clutch rivets is 1.2 mm (0.0472 in), with an allowable limit of 0.3 mm (0.012 in). Replace the clutch disc if these limits are exceeded. p. 201
What format is this New Holland T1510, T1520 manual in?
A 690-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I able to print pages from this New Holland T1510, T1520 manual?
Zero restrictions. The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Does this New Holland T1510, T1520 manual include wiring diagrams?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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