Part of the New Holland Repair Manuals.
This 192-page New Holland HM234, HM235, HM236 Repair Manual (OEM #87392141) puts every process drive, frame, and rotary cutting procedure for your Disc Mower in one place. Inside you'll find a full torque specification section, exploded views of the process drive and pinion assemblies, and step-by-step procedures covering PTO removal, shield service, and cutting head rebuilds. You get the fluid capacity charts too, so you're not mixing up gearbox oil by guesswork. Check pinion shaft backlash against 0.1125-0.3 mm before you button up the housing, and note the oil seal's self-tapping screws seat at roughly 6mm depth. No more flipping through a parts catalog hoping the diagram matches your serial number. Bookmarked by section (Introduction, Power Train, Body and Structure, Tool Positioning, Crop Processing), so you jump straight to the mower deck instead of hunting page by page. Pull it up on your phone at the mower and get the blades turning again.
What's Inside This Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-28 | Legal Advice, International Symbol, Safety Rules Precautionary Statements, Decals, Basic Instructions How to Use and Navigate Through This Manual, Torque Specification Tables |
| Power Production | 29-48 | PTO Power in |
| Power Train | 49-118 | Process Drive Primary Process Drive |
| Body and Structure | 119-136 | Frame Secondary Frame, Shield |
| Tool Positioning | 137-154 | Lifting |
| Crop Processing | 155-192 | Cutting Rotary Disc Cutting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| CUTTING Rotary disc cutting | K.10.E | p. 20 |
| PTO POWER IN | B.90.A | p. 22 |
| PTO from disc mower, turn twist collar (1) | counterclockwise to release ball detent | p. 34 |
| self-tapping screws for oil seal | approximately 6mm (.25" inch) | p. 73 |
| Pinion shaft backlash | 0.1125 - 0.3 mm | p. 89 |
| Boom break-away assembly tension | 51.5 mm (2 in) | p. 126 |
| NPT Pipe Fitting Torque (1/2" - 14) | 41 Nm | p. 23 |
| ORFS Connection Torque (Metric, 12mm Tube OD) | 43-47 Nm | p. 25 |
| Split Flange Mounting Bolt Torque (1/2" - 13) | 74-88 Nm | p. 25 |
| 37° Degree Flare Fitting Torque (SAE Dash -6) | 27-33 Nm | p. 26 |
| Cutter Bar Cutting Height | 16 to 60 mm | p. 27 |
| Disc Speed | 3154 RPM | p. 27 |
