Part of the New Holland Repair Manuals.
The hydrostatic drive is the system that scares people off these machines, and the New Holland 1915, 2115 service manual PDF walks through it in full: charge pump, variable displacement pump, and multi-function valve, across 444 pages under OEM number 40191520 for both self-propelled forage harvesters. Wiring diagrams trace the Metalert II metal detector and automatic knife sharpener circuits, while hydraulic schematics map flow from the priority divider through the main control valve to the spout orbit motor. Troubleshooting charts tie symptoms on the cutterhead, feed rolls, and reversing gearbox back to the part that caused them. Bench test your cranking motor at 10 volts and expect at least 100 amps of draw; torque the hydraulic pump cap screws 31 and 32 to 45 ft. lbs. (61 N·m). Guess wrong on that pump and you rebuild it twice. This bookmarked, text-searchable PDF gets your chopper back in the crop before the weather turns.
What's Inside This New Holland 1915, 2115 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 4-5 | Personal Safety, Machine Safety, Safety Rules, Precautionary Statements |
| Standard Torque Data - Hydraulic Tubes and Fittings | 6 | - |
| Hardware Key | 7-8 | Inch Hardware, Locknuts, Metric Hardware, Cap Screws, Carriage Bolts, Hex Nuts |
| 1915 Belt Drive | 9-24 | Main Drive Belts, Idler Assembly, Engine Drive Assembly |
| 2115 Transfer Gearbox | 25-30 | Transfer Gearbox Removal, Gearbox Disassembly, Parts Inspection, Gearbox Installation |
| Cutterhead Clutch Assembly | 31-36 | Clutch Removal, Clutch Disassembly, Parts Inspection, Clutch Assembly |
| Cutterhead Gearbox | 37-46 | Gearbox Removal, Gearbox Installation, Gearbox Disassembly, Oil Cooler, Pinion Assembly |
| Cutterhead | 47-58 | Cutterhead Bearings, Feed Roll Assembly, Knife Resetting, Knife Replacement, Knife Inspection |
| Knife Sharpener and Shear Bar | 59-76 | Shear Bar Maintenance, Knife Sharpening, Stone Carrier, Drive Chain, Shear Bar Adjuster, Solenoid Linkage |
| Reversing Gearbox | 77-88 | Input Shaft, Intermediate Shaft, Planetary Assembly, Gearcase Assembly, Clutch Parts, Forward Clutch |
| Feed Rolls and Feed Roll Drive | 89-106 | Feed Roll Jaw Clutch, Upper Feed Roll Drive Assembly, Lower Front Feed Roll, Attachment Drive Shaft, Smooth Roll |
| Blower and Spout Assembly | 107-122 | Blower Assembly, Blower Band, Blower Liner, Blower Cone, Blower Gearbox, Spout Hat, Worm Gear Assembly |
| Attachment Flotation System | 123-126 | Lift Cylinders, Flotation Spring, Spring Arm, Clevis |
| Transmission | 127-156 | Shifter Forks, Input Shaft, Countershaft, Pinion Shaft, Differential, Brake Assembly |
| Brake System | 157-168 | Master Cylinder, Slave Cylinder, Disc Brake, Brake Actuating Mechanism |
| Final Drive Repair | 169-184 | Final Drive Axle, Output Shaft, Input Shaft, Bearing Cups, Retaining Plate |
| Hydrostatic System | 185-258 | Charge Pump, Variable Displacement Pump, Fixed Displacement Motor, Multi-Function Valve, Loop Flushing Valve, Manual Displacement Control |
| Powered Rear Axle | 259-288 | Flow Limiters, Control Valve, Wheel Motor, Torque Hub, Planetary Reduction Drive |
| Hydraulic System | 289-352 | Hydraulic Pump, Priority Flow Divider, Main Control Valve, Steering Cylinder, Spout Orbit Motor, Lockout Valve |
| Electrical System | 353-376 | Alternator, Voltage Regulator, Battery, Cranking Motor, Solenoid, Wiring Diagrams |
| Metal Detector - Metalert Ii | 377-408 | Control Panel, Sensor Assembly, Diode Assembly, Stop Solenoid, Test Box |
| Automatic Knife Sharpener/Shear Bar Adjuster | 409-440 | Control Panel, Sharpener Motor, Shear Bar Adjuster, Knock Sensor, Kick Solenoid, Relay Board |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Compressed air blow gun pressure | 35 PSI (2.4 BAR) | p. 5 |
| Hydraulic pump cap screws (31, 32) torque | 45 ft. lbs. (61 N·m) | p. 296 |
| Battery size | SAE29H- 630 13 1/2” long, 6-13/16” wide and 9-7/32” high | p. 354 |
| No-load test voltage | 10 volts | p. 361 |
| No-load test minimum amperage draw | 100 amps | p. 361 |
| Sheave nut torque | 30 ft. lbs. (41 N·m) | p. 374 |
| Hydraulic Tube Nut Torque, 37° flared (1/4" O.D.) | 9-12 ft-lbs | p. 6 |
| Hydraulic Tube Nut Torque, 37° flared (1" O.D.) | 110-120 ft-lbs | p. 6 |
| Cutterhead Gearbox Oil Capacity | slightly more than 1 gal. (3.7 L) | p. 39 |
| 1915 | ||
| Drive belt deflection | 1/4 inch (6 mm) at 2-1/4 lbs. (10 N) | p. 375 |
| Main Drive Belt Tension (1915) | 12-3/4 inches | p. 12 |
| 2115 | ||
| Transfer Gearbox Oil Capacity | 2 quarts | p. 29 |
New Holland 1915, 2115 Common Problems This Manual Covers
New Holland 1915 main drive belt squealing under load with heavy vibration at the idler assembly
Check the idler bearings and sheave alignment first; a dry bearing throws vibration through the whole drive. Adjust the tension spring to 12-3/4 inches (32 cm) between the hooks using the procedure on page 12, then replace any belt showing glazing or cracked ribs. Run the vibration checks on page 23 if the shake stays.
Manual Section: 1915 Belt Drive p. 23Engine cranks slowly or the starter just clicks, machine sat outside overnight in cold weather
Test battery state of charge and clean both cable ends before condemning the starter. Verify the battery is the correct SAE29H-630 size listed on page 354. Bench test the starter no-load at 10 volts; a good motor draws 100 to 170 amps and spins 5500 to 7800 RPM per the specs on page 361.
Manual Section: Electrical System p. 361Alternator not charging, battery light on, battery goes dead after a day of chopping
Check charging output at rated speed; the alternator should produce 72 amps, and the test procedure on page 371 walks through it. Inspect the sheave for looseness and torque the sheave nut to 30 ft. lbs. (41 N·m) as shown on page 374. Clean the ground strap and battery terminals before replacing anything.
Manual Section: Electrical System p. 371Hydrostatic drive sluggish in both directions, hard to find neutral, oil running hot
Check charge pressure and oil level before pulling the pump; low charge oil makes the drive sluggish in both directions. Verify the multi-function valves hold system high pressure at 5000 PSI per page 191, and change the filter if the oil shows heat darkening. Work through the hydrostatic troubleshooting steps starting on page 185.
Manual Section: Hydrostatic System p. 185Hydraulic pump noisy and whining, oil foaming in the reservoir, spout and lift respond slow
Drain and refill the reservoir with 19 quarts of clean oil per the capacity on page 290; foaming usually means air on the suction side. Inspect the suction line for a loose fitting and torque 1 inch O.D. tube nuts to 110-120 ft-lbs using the chart on page 6. Replace the filter while the system is open.
Manual Section: Hydraulic System p. 290Cutterhead gearbox howling and running hot, wobble at the pinion under load
Drain the gearbox and inspect the old oil for metal flake; bearing failure shows up there before you hear it. Check pinion bearing alignment per the troubleshooting steps on page 46, then refill with slightly more than 1 gallon (3.7 L) of oil as specified on page 39. Verify the oil cooler lines flow freely.
Manual Section: Cutterhead Gearbox p. 46Frequently Asked Questions
What are the torque specifications for hydraulic tubes and fittings on the New Holland 1915, 2115 harvester?
Torque specifications vary by tubing size. For example, a 1/4 inch tubing size with a 7/16-20 thread size requires 9-12 foot pounds (12-16 Newton meters) for 37-degree flared fittings. A 1 inch tubing size with a 1-5/16-12 thread size requires 110-120 foot pounds (149-163 Newton meters). p. 6
What are the battery specifications for the 1915 and 2115 harvesters?
The electrical system is a 12-volt negative ground system. The correct battery size is SAE29H- 630, which is 13 1/2 inches long, 6-13/16 inches wide, and 9-7/32 inches high. p. 354
What is the recommended oil type and capacity for the 2115 transfer gearbox?
The 2115 transfer gearbox requires API GL5 80W-90 gear oil. The capacity is approximately 2 quarts (2 liters). p. 29
What is the correct belt tension adjustment for the 1915 main drive belt?
The main drive belt tension should be adjusted so the tension spring is 12-3/4 inches (32 cm) between the hooks. p. 12
What is the procedure for adjusting the shear bar to the knives on the harvester?
To adjust the shear bar, turn the engine on and engage the cutterhead at low idle. Use the sharpener/shear bar adjust switch on the control panel to initiate the sequence. The system will automatically adjust the shear bar until it is close to the knives without hitting. p. 67
How is this New Holland 1915 Service Manual delivered?
A 444-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print this New Holland 1915 manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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