Part of the New Holland Repair Manuals.
Need the factory manual for your New Holland TZ18DA, TZ22DA, TZ24DA, or TZ25DA? This 746-page Repair Manual (OEM #87350104) covers every system on these compact tractors, from the HST unit down to the mower deck gearbox. Open it up and you get full wiring diagrams with pinout charts for both TZ18DA build breaks, hydraulic schematics for the lift circuit and remote valves, and a deep troubleshooting section covering the HST, PTO, and electrical safety switches. You also get complete overhaul procedures for the engine, differential, and brakes, plus torque tables for every bolted assembly. Set the main system relief valve to 128 bar (1850 psi) and change that oil filter every 300 hours, exact numbers, not shop-manual guesswork. Your PTO won't engage or your HST won't hold neutral? Stop swapping parts and check the actual spec first. Bookmarked and searchable, so you can jump straight to the wiring section from your phone in the shop.
What's Inside This New Holland TZ18DA, TZ22DA, TZ24DA, TZ25DA Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 37-70 | Precautionary Statements (Personal Safety, Machine Safety, Information) |
| Engine Systems | 71-198 | Torque Specifications, Engine Lubrication System -- Description of Operation, Engine Oil Filter (Construction and Function, Maintenance) |
| FWD | 199-228 | Front Wheel Drive Axle -- Description of Operation (FWD, Manual, Auto, Auto Position, Full Time FWD, Power Flow) |
| Differential and Rear Axles | 229-250 | Bolt Torque Specifications, Special Tool, Differential, Differential Lock, Rear Axle, Operation |
| Hydrostatic Transmission | 251-332 | HST Unit (Removal, Disassembly, Inspection, Identification of Thrust Bearing Assemblies, Assembly, Installation, HST Adjustment, Neutral Adjustment, Pedal Adjustment, Cooling Fan, Transmission Range Gears) |
| PTO | 333-370 | Special Tools, Operation (Power Flow, PTO Off, Rear and Mid PTO on, Rear PTO on, Mid PTO on), Troubleshooting |
| Brakes | 371-386 | Adjustments (Brake, Parking Brake), Operation (Brakes, Troubleshooting, Overhaul (Brakes, Removal, Disassembly, Inspection, Assembly, Installation) |
| Hydraulic System | 387-458 | Description and Operation -- Hydraulic System Circuits (Oil Filter, Control Valve Assembly, Flow Priority Valve, Relief Valve, Check Valves, Safety Valve, Detent Balls, Oil Flow, Neutral Position, Lifting Position, Lowering Position, Drop Rate Control Valve) |
| Power Steering | 459-496 | Pressure Testing (Pump, Steering Valve and Relief Valve, Test Results, Steering Cylinder, Steering Control Relief Valve, Adjustment, Priority Flow Valve), Special Tools |
| Wheels | 497-502 | Wheel Tread Settings (Front Wheel Settings, Rear Wheel Settings), Tractor Weighting, Weighting for Stability, Weighting Limitations |
| Electrical System | 503-684 | Electrical Component Location and Function (TZ18DA Prior to Pin #HB20001 and TZ24DA, TZ18DA on or Above Pin #HB20001 and TZ22DA/TZ25DA, Component Locations and Functions, Ground Locations) |
| Cms -- 60Cms Mid Mount Mower | 685-728 | Mower Deck - Overhaul (Removal, 90° Gearbox, Blade Spindles and Pulley Holders, 90° Gearbox Components, Disassembly, Inspection, Assembly, Center Pulley Holder, RH and LH Pulley Holders, Installation, Lubrication, Gearbox, Mower Lift Linkage - Description of Operation, Mower Lift Linkage, Adjustment, Cutting Height) |
| Platform | 729-746 | Hood (Removal, Installation, Main Cowling, Dash Panel, Steering Column, Engine Removal and Installation, Seat, Rollover Protection System, Fender Assembly, Foot Platform, Fuel Tank) |
Every system also includes specifications.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil Pressure Switch Removal | 31 | p. 4 |
| Hydraulic Pump Removal | 30 | p. 4 |
| System Relief Valve Setting | 128 bar (1850 psi) | p. 390 |
| Oil filter replacement interval | 300 hours of operation | p. 395 |
| Engine Oil Capacity (With Filter) | 3.3 liters | p. 62 |
| Cooling System Capacity | 3.5 liters | p. 62 |
| Fuel Tank Capacity | 29.5 liters | p. 62 |
| Rear Axle & Transmission Capacity | 13 liters | p. 62 |
| Front Axle Differential/Final Reduction Gear Case Capacity | 2.0 liters | p. 62 |
| Engine Valve Clearance (Cold) - Intake | 0.20 mm (0.008") | p. 62 |
| Main System Protection Fuse | 40A Slow-Blow Fuse | p. 621 |
| Battery Type | 51BCI/450 CCA | p. 63 |
New Holland TZ18DA, TZ22DA, TZ24DA, TZ25DA Common Problems This Manual Covers
New Holland TZ18DA engine won't start or cranks slowly in cold weather
Check the troubleshooting chart. Verify battery matches the 51BCI/450 CCA spec on page 63 and terminals are clean and tight. Test cold cranking amps; if battery tests low, charge or replace. Confirm main system fuse (40A slow-blow, page 621) is intact before checking starter circuit.
Manual Section: Engine Systems: Troubleshooting ProceduresLoader or three-point hitch implement won't rise or lifts too slowly under load
Check the hydraulic troubleshooting chart and verify fluid level and filter condition first. Test system relief valve pressure against the page 390 setting of 128 bar (1850 psi). If pressure reads below spec, remove and inspect the relief valve for debris or a weak spring, then check the safety valve opens at 245 bar (3552 psi) per page 396.
Manual Section: Hydraulic System Troubleshooting p. 390PTO slips under load or continues to creep and rotate when fully disengaged
Check the PTO troubleshooting chart for slippage and creep conditions. Inspect the clutch pack for worn or glazed friction discs and verify linkage adjustment is within spec. Drain and refill the rear axle and transmission housing, 13 liters capacity per page 62, with the correct fluid since low or contaminated oil causes slippage under load. Adjust clutch linkage and retest.
Manual Section: PTO TroubleshootingBattery charge indicator light stays on with engine running at operating RPM
Check the charging circuit troubleshooting chart. Verify alternator belt tension and battery connections; confirm the battery is a 51BCI/450 CCA unit per page 63. Test alternator output voltage at idle and at 2000 RPM; if below 13.5 volts, inspect brushes and the voltage regulator. Confirm the main system fuse (40A slow-blow, page 621) has not blown first.
Manual Section: Electrical System Troubleshooting (Charging Circuit) p. 621Brakes grab or pull hard to one side during stops on level ground
Check the brake troubleshooting chart in the Brakes section starting page 371. Inspect brake linings for uneven wear and verify equal free-play adjustment on both pedals. Torque rear wheel disc-to-axle bolts to 122 N⋅m (90 ft. lbs.) per page 66, since loose wheel bolts can mimic a one-sided pull. Bleed and adjust both sides equally, then road test.
Manual Section: Brakes Troubleshooting p. 371Steering wheel is hard to turn or won't return to center at idle
Check the power steering troubleshooting chart in the section starting page 459. Verify fluid level and inspect the pump drive belt for slippage. Pressure test the steering pump and relief valve; minimum flow is 11.7 LPM (3.1 GPM) for TZ22DA/TZ25DA models and 11.4 LPM (3 GPM) for TZ18DA/TZ24DA models, per page 457. Replace the pump if flow falls below spec.
Manual Section: Power Steering Troubleshooting p. 459Frequently Asked Questions
What is the torque specification for the cylinder head bolts on a New Holland TZ25DA tractor?
The torque specification for cylinder head bolts on New Holland TZ18DA, TZ22DA, TZ24DA, and TZ25DA tractors is 49 - 52 N⋅m (36 - 38 ft. lbs.). This is a critical specification for engine assembly. p. 85
What is the torque specification for the hydraulic pump mounting bolts on a New Holland TZ24DA?
The hydraulic pump mounting bolts should be torqued to 22-28 N⋅m (16-20 ft. lbs.) during installation. This ensures the pump is securely fastened to the engine oil pump. p. 424
What is the engine crankcase oil capacity with the filter for New Holland TZ series tractors?
The engine crankcase oil capacity with the filter for New Holland TZ18DA, TZ22DA, TZ24DA, and TZ25DA hydrostatic models is 3.3 liters (3.5 U.S. qts.). p. 62
What is the cold valve clearance for both intake and exhaust valves on New Holland TZ series tractors?
The cold valve clearance for both intake and exhaust valves on New Holland TZ18DA, TZ22DA, TZ24DA, and TZ25DA hydrostatic models is 0.20 mm (0.008″). p. 62
What format is this New Holland TZ18–TZ25 Series manual in?
Immediate download of the complete 746-page searchable Repair Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this New Holland TZ18–TZ25 Series manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Does this New Holland TZ18–TZ25 Series manual include hydraulic schematics?
Included. Hydraulic system schematics cover all circuits, control valves, and component specifications for the New Holland TZ18–TZ25 Series.
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