Part of the New Holland Repair Manuals.
Looking for the New Holland TT45A, TT50A repair manual PDF? All 682 pages of this factory repair manual (OEM #87655301) cover both tractor models, from engine overhaul through clutches, transmission, rear axle, PTO, brakes, steering, and front axle. You get complete wiring diagrams for the battery, alternator, starter, and harnesses, plus hydraulic schematics covering the pump, lift assembly, control valve, and relief valve. A full troubleshooting section and metric bolt torque tables back up every teardown. Torque the cylinder head bolts to 98-103 N·m in sequence, half value first, then final. Check clutch plate thickness at 10.5 ± 0.3 mm for the transmission and 7.6 ± 0.3 mm for the PTO before you reassemble. Bookmarked by system and keyword-searchable; pull it up on your phone and get back in the field.
What's Inside This New Holland TT45A, TT50A Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 29-66 | Federal Emissions Warranty, California Emission Control Warranty Statement, Health and Safety Precautions, Safety |
| Engine | 67-198 | Specifications, Metric Bolt Torque Specifications, Troubleshooting, Overhaul |
| Clutches | 199-232 | Clutch Pedal, Cross Shaft, Release Bearing Assembly, Clutch Assembly, Release Fingers |
| Transmission System | 233-300 | Transmission Assembly, Input Shaft, Reverse Gear, Pinion Shaft, Gear Shift Lever |
| Mechanical Rear Wheel Drive | 301-356 | Ring Gear, Differential Assembly, Differential Housing, Rear Axle, Final Drive Housing |
| Power Take-Off | 357-382 | PTO Levers, Internal Linkages, PTO Shafts, PTO Clutch, PTO Brake |
| Braking System | 383-400 | Brake Pedals, External Linkages, Parking Brake Linkage, Brake Assembly, Brake Actuator |
| Hydraulic System | 401-462 | Hydraulic Pump, Hydraulic Lift Assembly, Control Valve, Lift Arm Shaft, Relief Valve |
| Steering Systems | 463-500 | Hydrostatic Steering Reservoir, Steering Motor, Steering Cylinder, Steering Pump, Relief Valve |
| Front Axle | 501-520 | Front Axle Assembly, Front Wheel Hub, Spindle Assembly, Axle Pivot Pin, Swivel Pin |
| Electrical System | 521-674 | Battery, Alternator, Starter Motor, Instrument Panel, Wiring Harnesses, Relays |
| Bodywork | 675-682 | Engine Hood Panel, Rear Wheel Fenders, Roll-Over Protection Bar, Battery |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery | 12 Volts - 600 CCA BCI Group-47 | p. 64 |
| Cylinder Head Bolts | 98 - 103 N⋅m (72.3 - 76 ft-lb) | p. 80 |
| head bolts final torque | 98 - 103 N·m (72.3 - 76 ft-lb) | p. 139 |
| Transmission clutch plate thickness | 10.5 ± 0.3 mm (0.41 ± 0.0118 in) | p. 200 |
| PTO clutch plate thickness | 7.6 ± 0.3 mm (0.30 ± 0.0118 in) | p. 200 |
| Bolts securing wheel disc to wheel shaft | 267 Nm (197 ft-lb) | p. 335 |
| Filter replacement interval | after the first 50 hours of use and every 300 hours of use thereafter | p. 409 |
| Fuse 1 rating | 15 amp | p. 529 |
| Fuse 2 rating | 15 amp | p. 529 |
| Fusible link rating | 20 amps | p. 529 |
| Electrolyte level above plates | 6.35 mm | p. 528 |
| Fuel shutoff solenoid actuating pin protrusion distance A | 25.5 - 26.4 mm (1.004 - 1.040 in) | p. 560 |
New Holland TT45A, TT50A Common Problems This Manual Covers
New Holland TT45A transmission growls in neutral, noise gets louder when a range is engaged
Drain and refill the transmission and hydraulic sump with 19.5 liters of fresh oil, the capacity listed on page 65, then run through every range and listen again. If the growl continues, split the tractor and inspect the input and pinion shaft bearings for spalling; adjust bearing preload or replace any rough bearings.
Manual Section: Transmission System p. 233Rockshaft lifts jerky under load, three point hitch feels weak and drops implements slowly
Check hydraulic oil level first; the combined transmission and hydraulic sump holds 19.5 liters. Replace the hydraulic oil filter, due after the first 50 hours and every 300 hours per page 409, and inspect the pump inlet line for air leaks. Test system pressure and verify the relief valve opens at 120 bar (1740 psi).
Manual Section: Hydraulic System p. 401Engine cranks slowly or will not turn over at all on cold mornings
Test the battery first: verify a 12 volt, 600 CCA unit with electrolyte sitting 6.35 mm above the plates, per page 528. Clean and tighten both cable clamps. If cranking stays slow, bench test the starter motor and compare draw against the 500 amp at 7.5 volt loaded spec on page 651.
Manual Section: Engine TroubleshootingPTO shaft keeps turning with lever disengaged, implement will not stop spinning
Check transmission oil level and condition; contaminated oil makes PTO clutch plates drag. Measure PTO clutch lever free play and adjust to 2.5 - 5 mm (0.098 - 0.197 in), the spec on page 200. If drag continues, pull the clutch and measure plate thickness against the 7.6 mm PTO plate specification.
Manual Section: Power Take-Off p. 357Warning lights and dash gauges all went dead at the same time
Check the fuse panel before chasing wiring. Pull each fuse and test continuity; the circuits use 15 amp and 20 amp fuses, ratings listed on page 529. Test the 20 amp fusible link as well. If all fuses check good, trace the instrument circuit using the wiring diagram and verify voltage at the panel connector.
Manual Section: Electrical System p. 521Clutch slips pulling under load, engine revs up but tractor barely moves
Measure clutch pedal free play and adjust to 45 - 50 mm (1.77 - 1.97 in), the spec on page 200. If slipping continues after adjustment, split the tractor and measure the transmission clutch plate against the 10.5 ± 0.3 mm thickness spec; replace worn plates and inspect the flywheel face for glazing.
Manual Section: Clutches p. 199Frequently Asked Questions
What are the torque specifications for the cylinder head bolts on a New Holland TT45A or TT50A tractor?
The cylinder head bolts for both the TT45A and TT50A models must be tightened to a final torque specification of 98 to 103 N⋅m (72.3 to 76 ft-lb). p. 80
What are the replacement specifications for clutch plates?
The transmission clutch plate thickness should be 24 mm (0.945 in) and the PTO clutch pressure plate thickness should be 22 mm (0.866 in). If the organic facings are found to be soaked with oil, the discs must be replaced. p. 226
What is the correct valve clearance for the engine?
The intake and exhaust valve clearance for both the N844 and N844L engines should be adjusted to 0.2 mm (0.008 in) when in a cold condition. p. 77
What is the required alternator drive belt deflection?
The alternator drive belt deflection should be 10 to 15 mm (0.39 to 0.59 in) when applying 9 to 11 kg (20 to 25 lb) of force between the crank pulley and the alternator pulley. p. 650
What is the engine oil capacity for the TT45A and TT50A tractors?
The approximate engine oil capacity for the TT45A is 6 liters (6.3 quarts), and for the TT50A it is 17 liters (7.3 quarts). p. 65
How quickly can I access this New Holland TT45A manual after buying?
Instant PDF download. You get the full 682-page searchable Repair Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I free to print this New Holland TT45A Repair Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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