Part of the New Holland Repair Manuals.
Hydraulic throwing and latch cylinders are the hardest thing on a bale thrower to diagnose without factory data, and that is where this New Holland 75 service manual PDF, OEM 40007040, spends most of its 20 pages. Four models are inside, two belt type and two pan type. Schematics trace oil from the pump through the relief and flow control valves to both cylinders, a wiring diagram maps the pan type's motor, actuator, control box, and breakaway connector, and troubleshooting tables link poor wagon filling or loose bales back to PTO speed, belt tension, and valve spool condition. Set the Model 70 pump drive belt spring at 6 inches (152.5 mm) hook to hook, and check output against the rated 9.5 GPM before condemning a valve. When the thrower quits mid-field, nobody is beside you with the answer. Print the pages for the job, let them catch grease on the bench, and keep the bookmarked, text-layer PDF as your master copy.
What's Inside This New Holland 70, 72, 75, 77 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction, General Information and Safety | 1-3 | Equipment Orientation (Left Side, Right Side and Direction of Travel) Together with the Safety Precautions Covering Loose Clothing, Moving Parts, Shields and Clutch Engagement |
| Models 70 and 72 Belt Type - Hydraulic System | 4-5 | Hydraulic Pump, Relief Valve and Flow Control Valve Feeding the Throwing Cylinder and Latch Cylinder, With the Throwing Belt Driven Off the Motor Sheave |
| Models 70 and 72 Belt Type - Flow and Pressure Test Procedure | 6 | Gauge and Flow Meter Hookup with the Pump, Motor and Relief Valve Settings Checked Against PTO Speed |
| Models 70 and 72 Belt Type - Troubleshooting | 7-9 | Wagon Filling Faults Traced Through Pump Drive Belt Tension, Throwing Belt Tension and Roll Speed; Sheave Change From 8 Inch to 8 3/4 Inch with Part Numbers 859420, 859421 and Belt 9600753; Expected 2900 PSI at 9.5 GPM on the Model 70 and 11.4 GPM on the Model 72 |
| Models 75 and 77 Pan Type - Hydraulic System | 10-11 | Hydraulic Pump, Relief Valve and Flow Control Valve Feeding the Pan Cylinder, Worked Through the Lock-Out Handle and Manual Trip Handle with the Distance Control Indicator Dial |
| Models 75 and 77 Pan Type - Flow and Pressure Test Procedure | 12-13 | Cessna Gear Model 24507-Lae Pump Rated 26 GPM at 1740 RPM (540 PTO RPM), Relief Valve Maximum 2250 Plus or Minus 50 PSI and Minimum 800 Plus or Minus 50 PSI, Plus the Indicator Setting to Pressure and Minimum GPM Guideline Table |
| Models 75 and 77 Pan Type - Electrical System | 14 | Electrical Circuit for the Pan Type Thrower Covering Motor and Actuator Wiring with the Control Box, Breakaway Connector and Circuit Breaker |
| Models 75 and 77 Pan Type - Troubleshooting | 15-20 | Wagon Filling and Bale Density Faults Traced Through PTO Speed, Valve Spool and Latch Cylinder Operation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Model 70 pump drive belt adjustment | 6 inches (152.5 mm) from inside to inside spring hook | p. 8 |
| Model 70 roll drive belt adjustment | 1/8 inch (3 mm) gap between coils of the spring | p. 7 |
| Model 70 motor sheave replacement | 8 3/4 inches (222 mm) sheave halves | p. 8 |
| Maximum Bale Weight | 80 lbs | p. 7 |
| 70 | ||
| Model 70 Hydraulic Pump Capacity | 9.5 GPM | p. 5 |
| Model 70 Reservoir Capacity | 5 gallons | p. 5 |
| 72 | ||
| Model 72 Hydraulic Pump Capacity | 11.4 GPM | p. 5 |
| 70, 72 | ||
| Relief Valve Pressure Setting | 2900 PSI | p. 5 |
| 75, 77 | ||
| Model 75/77 Hydraulic Pump Capacity | 26 GPM | p. 11 |
| Relief Valve Adjustment Range | 800-2250 PSI | p. 11 |
| Model 75/77 Reservoir Capacity | 9 gallons | p. 11 |
New Holland 70, 72, 75, 77 Common Problems This Manual Covers
New Holland 70 bale thrower will not throw bales far enough, bales pile up at front of wagon
Check the roll drive belt spring on page 7 and adjust until there is a 1/8 inch (3 mm) gap between the spring coils. Verify bale weight stays under 80 lbs (36 kg); heavy, damp bales slip on the belts. Replace belts that are worn smooth before tightening any further.
Manual Section: Models 70 and 72 Belt Type Troubleshooting p. 7Pump drive belt keeps slipping and needs constant tightening, throwing belts lose speed under load
Inspect the pump drive belt for glazing and check spring tension. On Model 70, set the spring to 6 inches (152.5 mm) measured inside to inside of the spring hooks, per page 8. If throw distance still falls short, install the 8 3/4 inch (222 mm) motor sheave halves with the matching longer belt.
Manual Section: Hydraulic System p. 8Hydraulic motor runs slow and throwing belts bog down when a bale enters the thrower
Test system pressure using the procedure on page 10 and verify the relief valve opens at 2900 PSI. On Model 70 the pump should deliver 9.5 GPM at rated speed; low flow points to a worn pump or a restricted suction line. Drain and refill the reservoir with clean oil if it shows contamination.
Manual Section: Test Procedure p. 10Pan thrower does not trip on the bale or throws bales straight up
Check hydraulic pressure with a gauge and adjust the relief valve within its 800 to 2250 PSI range; too little gives a weak trip, too much throws bales straight up. Verify pump output reaches 26 GPM at rated PTO speed, then work through the pan trip checks in the troubleshooting section starting on page 13.
Manual Section: Troubleshooting p. 13Throwing belts chew on bales and break twine before launch, bales come apart
Follow the twine breaking and belt grooving checks on page 7. Reduce bale density so bales weigh no more than 80 lbs (36 kg) and adjust bale length for a solid grip. Inspect the throwing belts for glazed surfaces or grooves; replace worn belts rather than compensating with extra tension.
Manual Section: Models 70 and 72 Belt Type Troubleshooting p. 7Frequently Asked Questions
What are the replacement specifications for Thrower drive belts?
For Model 70, the pump drive belt should be adjusted to a 6-inch (152.5 mm) gap measured from the inside to the inside of the spring hook. For Model 72, the spring is not adjustable and must be installed correctly. p. 8
What is the oil capacity for the Model 70 and 72 belt-type thrower reservoir?
The reservoir for the Model 70 and 72 belt-type throwers should be refilled with approximately 5 gallons (18.9 L) of oil to the level of the check plug on the side of the reservoir. p. 5
What is the relief valve pressure setting for the Model 70 and 72 belt-type throwers?
The relief valve in the flow control valve for both the Model 70 and 72 belt-type throwers should be set at 2900 PSI + 50 PSI. p. 5
What is the relief valve pressure adjustment range for the Model 75 and 77 pan-type throwers?
On the Model 75 and 77 pan-type throwers the relief valve in the control valve is adjustable from 800 to 2250 PSI + 50 PSI. p. 11
What is the recommended maximum bale weight for the thrower systems?
To ensure proper operation and prevent issues, the bale weight should be adjusted to a maximum of 80 lbs. (36 kg). p. 7
Will this New Holland 70 Service Manual download right away?
A single searchable PDF file of 20 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Can I print just the pages I need from this New Holland 70 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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