Part of the New Holland Repair Manuals.
Need the factory book for your New Holland H6730, H6740, or H6750 disc mower? This 146-page service manual covers the full family, driveline to cutter bar. Inside you get hydraulic cylinder disassembly and rebuild procedures, a complete driveline section spanning the Twist Lock, overrunning clutch, U-joints, and bevel gearbox, plus exploded parts views and a full torque chart to back every reassembly step. Set the lift cylinder piston rod locknut to 163-176 N⋅m (120-130 lb ft), and if you're chasing a cylinder that won't hold under load, check the inlet port orifice plate against the 0.040 in spec before you start swapping seals. No more eyeballing hitch pin height or guessing knife kit compatibility off a parts counter guy's memory. It's bookmarked by section, so you can jump straight from the cutter bar to the decal charts without scrolling. Download it, load it on your phone, and get back under the mower.
What's Inside This New Holland H6730, H6740, H6750 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-54 | Precautionary Statements, Before Using the New Machine, After 8 Hours of Operation, Tractor Requirements, Attaching the Mower to the Tractor |
| Hydraulics | 55-60 | Hydraulic Cylinders, Disassembly, Inspection, Assembly |
| Drivelines | 61-130 | Twist Lock, Overrunning Clutch, U-Joints, Belt Tension Jackshaft, Bevel Gearbox, Cutter Bar |
| Optional Equipment | 131-136 | Left Swathboard Kit, High Stubble Kit, 7 Degree Twist Knives, 14 Degree Twist Knives, Serrated 14 Degree Twist Knives, V Knives |
| Decals | 137-146 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Lift cylinder piston rod locknut torque | 163 - 176 N⋅m (120 - 130 lb ft) | p. 58 |
| Lift cylinder inlet port orifice plate size | 0.040 in | p. 56 |
| General instruction for oil leaks | Any leak should be fixed immediately | p. 36 |
| Cutting Height | 32 mm - 89 mm (1.25 in - 3.5 in) | p. 21 |
| Knives Per Discs | 2 | p. 21 |
| Disc Cutting Diameter | 500 mm (19.7 in) | p. 21 |
| Disc Speed | 3000 rpm | p. 21 |
| H6730 | ||
| Limit chain adjustment (hitch pins from ground, standard operation) | as close to (but not less than) 609 mm (24 in) | p. 9 |
| PTO HP Required (minimum) | 45 | p. 21 |
| H6740, H6750 | ||
| Limit chain adjustment (hitch pins from ground, standard operation) | as close to (but not less than) 457 mm (18 in) | p. 15 |
| Clearance between outside edge of tractor tire and mower inner shield (for hex-shaped lower lift pins adjustment) | 102 mm (4 in) | p. 11 |
| H6740 | ||
| PTO HP Required (minimum) | 55 | p. 21 |
New Holland H6730, H6740, H6750 Common Problems This Manual Covers
New Holland H6750 gearbox drive module binds and won't spin freely after rebuild
Stop and back out every drive module bolt before reassembly. Check for cross-threading by hand-starting each bolt fully before torquing. Torque drive module fasteners to the driveline torque specifications, then rotate the module by hand to confirm it spins free with no binding before reattaching the cutter bar.
Manual Section: DrivelinesDisc mower vibrates excessively and rides too close to the tractor tires
Check the hex-shaped lower lift pins on page 11 first. Adjust them so clearance between the outer edge of the tractor tire and the mower inner shield measures 102 mm (4 in). If vibration persists after that adjustment, work through the vibration causes listed in the troubleshooting procedures.
Manual Section: General TroubleshootingCutter bar won't float correctly or breaks back too easily in the field
Verify the limit chain setting before touching the flotation spring. On H6740 and H6750 units, set hitch pin height as close as possible but not less than 457 mm (18 in) from the ground per page 15. Then check flotation spring length and top link adjustment against the general troubleshooting guidance.
Manual Section: General TroubleshootingHydraulic lift cylinder leaks oil or won't hold under load
Shut the tractor down and fix any visible oil leak immediately, don't run the mower with a weeping cylinder. Remove the cylinder and inspect the barrel for nicks or burrs and check seals for wear per the hydraulic cylinder inspection at page 57. When reassembling, torque the piston rod locknut to 163-176 N⋅m (120-130 lb ft) as specified on page 58.
Manual Section: Hydraulic Cylinders Inspection p. 57Breakaway link on the cutter bar keeps triggering or shows visible wear
Measure the free length of the breakaway spring and compare it against the acceptable range in the breakaway link inspection procedure. Check every mounting bolt for looseness and retorque to the driveline torque specifications. Replace the link if spring free length is out of tolerance or the plate shows gouging.
Manual Section: Breakaway Link InspectionMower won't reach proper cutting angle or leaves streaking and uneven stubble
Check the top link length first since it sets cutter bar tilt, then confirm cutting height falls within 32 mm to 89 mm (1.25 in to 3.5 in) as specified on page 21. If streaking continues after that adjustment, run through the uneven stubble and cutting angle causes in the troubleshooting procedures.
Manual Section: General TroubleshootingFrequently Asked Questions
What are the torque specifications for the bolts that secure the bevel gearbox to the drive module on a New Holland H6740 Disc Mower?
When installing the bevel gearbox onto the drive module, the rear bolts should be torqued to 159 N⋅m (117 lb ft). The front bolts should not be fully tightened at this stage as they will be removed later for skid shoe installation. p. 90
What is the oil capacity and recommended service interval for the bevel gearbox on New Holland H6730, H6740, and H6750 disc mowers?
The bevel gearbox holds 1100 ml (37 oz) of New Holland Ambra Hypoide 90 gear oil. The oil should be changed after the first 50 hours of use, and subsequently every 200 hours or yearly, whichever occurs first. p. 36
What is the oil capacity and recommended service interval for the drive module on New Holland H6730, H6740, and H6750 disc mowers?
The drive module holds 300 ml (10 oz) of New Holland Ambra Hypoide 90 gear oil. The oil should be changed after the first 50 hours of use, and subsequently every 200 hours or yearly, whichever occurs first. p. 37
What is the oil capacity and recommended service interval for the cutter bar modules on New Holland H6730, H6740, and H6750 disc mowers?
Each cutter bar module holds 300 ml (10 oz) of New Holland Ambra Hypoide 90 gear oil. The oil should be changed after the first 50 hours of use, and subsequently every 200 hours or yearly, whichever occurs first. p. 105
Is this New Holland H6730, H6740, H6750 Service Manual a digital download?
This is a 146-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 H6730, H6740, H6750 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this New Holland H6730, H6740, H6750 manual cover the hydraulic system?
No, the manual covers hydraulic cylinder disassembly, inspection, and assembly, including specifications for the lift cylinder and its orifice plate, but it does not contain complete hydraulic schematics, flow diagrams, valve configurations, or pressure specifications for the entire system.
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