New Holland TD3.50 - User Manual

Questions and Answers

B
brownrobertNov 6, 2025
What to do if New Holland TD3.50 Tractor engine does not start?
- O
  Olivia PorterNov 6, 2025
  If your New Holland Tractor's engine won't start, several factors could be responsible. The battery might be partially flat, requiring a check, charge, or replacement. The battery poles could be corroded or have loose connections needing cleaning and tightening. Other potential causes include incorrect injection pump timing (readjust pump timing), impurities or water in fuel lines (disconnect and clean fuel lines), an empty fuel tank (fill the tank), a faulty fuel delivery pump (check and replace if necessary), air in the fuel system (bleed the system), a faulty starter motor or thermostarter (repair or replace), low idle speed (adjust the idle speed), irregular fuel distribution from the injection pump (check fuel distribution), a clogged oil filter (replace filter elements), incorrect va...
D
Donna BrownNov 15, 2025
What to do if New Holland Tractor engine runs irregularly and does not build up power?
- J
  John GriffinNov 15, 2025
  If your New Holland Tractor engine runs irregularly and doesn't build up power, it could be due to several reasons. The water pump might be defective, requiring repair or replacement. A defective thermostat (replace thermostat) or an ineffective radiator (wash channels, check for leaks, and repair) could also be responsible. Other potential causes include low water level (add coolant), incorrect timing (check and adjust), incorrect injection pump calibration (calibrate to specified values), a clogged air filter (clean or replace), incorrect timing of the injection pump (adjust timing), a damaged automatic advance governor or worn distributor shaft (calibrate the pump), irregular distribution by the injection pump (clean, repair, and calibrate injectors), or impurities/water in fuel lines (...
N
nathan08Nov 26, 2025
Why does my New Holland TD3.50 engine make abnormal knocking noises?
- J
  Jamie DavisNov 27, 2025
  Abnormal knocking noises in your New Holland Tractor's engine can stem from several issues. A damaged fuel delivery pump might be the culprit, necessitating replacement. Incorrect valve settings, low cylinder pressure (test compression and rectify if necessary), or a clogged air filter (clean or replace) could also contribute. Other potential causes include incorrectly adjusted accelerator pedal linkage or maximum speed adjusting screw, partially clogged or damaged injectors (clean, repair, and calibrate), impurities in fuel lines (clean or replace), incorrect injection pump timing (adjust timing), excessive crankshaft bearing gap (rectify crankshaft and bushes), unbalanced crankshaft (check balance), loose flywheel bolts (tighten to prescribed torque), non-parallel connecting rod axes (st...

Summary

INTRODUCTION AND SAFETY

Important Warnings

Critical safety instructions and responsibilities for maintenance and repair operations.

CLUTCHES (Section 18)

Clutch Specifications, Torque, and Tools

Technical specifications, torque values, and special tools for clutch service.

Clutch Troubleshooting and Repair

Common clutch issues, their causes, and recommended repair procedures.

TRANSMISSION (Section 21)

Mechanical Transmission Operations

Details on mechanical transmission system, including specs, removal, and overhaul.

Reverser Service

Procedures for servicing the reverser component, including assembly and overhaul.

DRIVE LINES (Section 23)

Drive Lines Specifications and Torque

Technical data, torque settings, and necessary tools for drive line service.

Drive Lines Assembly and Removal

Procedures for disassembling, installing, and removing drive line components.

FRONT AXLE MECHANICAL TRANSMISSION (Section 25)

Front Axle Transmission Specs & Torque

Technical specifications and torque values for the front axle mechanical transmission.

Front Axle Differential Service

Procedures for overhauling the front axle differential.

REAR AXLE AND TRANSMISSION (Section 27)

Rear Axle Transmission Specs & Torque

Technical specifications and torque values for the rear axle and transmission.

Rear Transmission Assembly

Procedures for removing, installing, and assembling the rear transmission.

DIFFERENTIAL SERVICE (Chapter 2)

Differential Assembly and Repair

Step-by-step guide for assembling and repairing the differential.

POWER TAKE-OFF (PTO) (Section 31)

PTO Technical Information and Service

Details on PTO operation, specifications, removal, installation, and overhaul.

BRAKING SYSTEM (Section 33)

Braking System Overview and Controls

Information on the braking system, specifications, and brake control service.

HYDRAULIC SYSTEM (SECTION 35)

Hydraulic System Introduction and Diagrams

Overview of the hydraulic system, circuit identification, and diagrams.

Hydraulic Pump Service

Technical information, specifications, and service procedures for the hydraulic pump.

STEERING SYSTEM (SECTION 41)

Steering System Specifications and Tools

Specifications, tightening torques, and special tools for the steering system.

STEERING SYSTEM OPERATION AND TROUBLESHOOTING

Steering System Removal and Overhaul

Procedures for removing, installing, and overhauling the steering system.

ELECTRICAL SYSTEM (SECTION 55)

Electrical Instruments and Components

Information on instruments, transmitters, sensors, switches, and general components.

Starting and Charging Systems

Technical data, operation, and service for the engine's starting and charging systems.

Battery Service

Technical information, operation, and maintenance procedures for the battery.

ELECTRICAL SYSTEM (SECTION 55)

Electrical Circuits Details

Information on fuses, symbols, wire coding, and specific electrical circuits.

GENERAL INSTRUCTIONS AND PROCEDURES

Important Notice and General Advice

Crucial information on authorized workshops, shims, seals, O-rings, sealants, bearings, and roll pins.

GENERAL INFORMATION AND NOTICES

Spare Parts and Equipment Guidelines

Guidelines for ordering and using genuine New Holland spare parts and recommended equipment.

Notices and Tractor Movement Procedures

Important notices and safety procedures for moving the tractor with the battery removed.

SAFETY RULES

Safety Symbol Interpretation and Accident Prevention

Explanation of safety symbols and general precautions to prevent accidents.

General Safety Procedures

Fundamental safety rules for repair and maintenance operations.

OPERATIONAL SAFETY PRECAUTIONS

Detailed Safety Instructions

Detailed safety instructions for towing, lifting, handling materials, and personal protective equipment.

OPERATIONAL SAFETY GUIDELINES

Startup, Engine, and Electrical Safety

Safety measures for engine startup, operation, electrical systems, and battery handling.

Hydraulic, Tyre, and Component Handling Safety

Safety precautions for hydraulic systems, wheels, tyres, and heavy component handling.

LUBRICANT CAPACITIES AND SPECIFICATIONS

ENGINE - CHAPTER 1

Engine Technical Data Overview

General technical information, fuel system, and torque values for the engine.

Engine Visual Aids and Troubleshooting

Longitudinal/cross-sectional views, lubrication system diagram, and troubleshooting guide.

Engine Removal, Installation, and Overhaul

Procedures for engine removal, installation, checking dimensions, and overhaul.

ENGINE TECHNICAL INFORMATION: TYPE AND SYSTEMS

Engine Type, Lubrication, and Cooling Specs

Details on engine type, displacement, power, lubrication system, and cooling system specs.

ENGINE TECHNICAL INFORMATION: LUBRICATION & COOLING

Lubrication System Details

Specifics on pump drive, oil filter, oil pressure, safety valve, radiator, fan, and water pump.

Cooling System Operation

Information on radiator, fan, water pump, and temperature control mechanisms.

ENGINE TECHNICAL INFORMATION: TIMING & FUEL

Timing Gears, Camshaft, and Fuel System Specs

Dimensions and clearances for timing gears, camshaft, and specifications for the fuel system.

ENGINE TECHNICAL INFORMATION: TURBO & INJECTORS

Turbocharger, Injection Pump, and Injector Details

Specifications for the turbocharger, Bosch injection pump, and injectors.

ENGINE COMPONENT DATA: PUMPS & CRANKCASE

Fuel Lift Pump and Crankcase Dimensions

Dimensional data for the fuel lift pump and engine oil sump/crankcase.

CRANKSHAFT BEARINGS SPECIFICATIONS

CRANKSHAFT & CONNECTING ROD DATA

Crankshaft Measurements and Wobbling

Continued crankshaft specifications and details on wobbling of flywheel seat surfaces.

Connecting Rod Specifications

Specifications and data for the connecting rod, including its components.

PISTON DATA

TIMING GEARS AND VALVE PUSH ROD CUPS

Timing Gears and Camshaft Clearances

Specifications for timing gear clearances, camshaft dimensions, and backlash.

Valve Push Rod Cup Dimensions

Dimensions and clearances for valve push rod cups and their seats.

ROCKER ARM SHAFT AND VALVES

CYLINDER HEAD SPECIFICATIONS

ENGINE FLUID SYSTEMS INFORMATION

Lubrication System Specifications

Specifications for lubrication system components like gears, pump, and springs.

Cooling System Specifications

Specifications for cooling system components like shaft fit sizes and propeller seals.

ENGINE TORQUE SPECIFICATIONS

Angular Tightening Torque Values

Specific torque and angle values for engine component assembly, e.g., cylinder head.

General Tightening Torques

Standard torque values for various engine bolts and fasteners.

SPECIAL TOOLS FOR ENGINE SERVICE

APPARATUS DIAGRAMS

ENGINE DIAGRAMS: LONGITUDINAL SECTION

ENGINE DIAGRAMS: CROSS SECTION

ENGINE LUBRICATION SYSTEM DIAGRAM

ENGINE COOLING SYSTEM DIAGRAM

ENGINE TROUBLESHOOTING: STARTING & SPEED

Engine Starting Issues

Possible causes and solutions for the engine failing to start.

Engine Speed Reduction and Stoppage

Causes and troubleshooting steps for reduced engine speed or stopping.

ENGINE TROUBLESHOOTING: PUMPS & POWER

Water Pump and Power Issues

Reasons and solutions for water pump malfunction and poor engine power.

ENGINE TROUBLESHOOTING: KNOCKING NOISES

Engine Knocking Noises

Identification and solutions for abnormal knocking sounds originating from the engine.

New Holland TD3.50 Specifications

General

Engine Power	50 HP
Engine Type	Diesel
Fuel Tank Capacity	60 liters
Hydraulic System	Open Center
Hydraulic Pump Flow	40 L/min
Steering	Hydrostatic
Transmission	Synchro Shuttle
Displacement	2.9 L
PTO Speed	540
Number of Gears	12 forward / 12 reverse