The problem most knife drives have, is the loss of stroke length and force. This is addressed with the SCH ProDrive. The Pro-Drive planetary gear system is in rotation at all times. Therefore, there are no dead spots as in wobble or crank drives where arms and levers have to come to a full stop twice per revolution to change direction.
These advantages mean that a change to a SCH Pro-Drive knife drive and cutterbar system will pay for itself in just a short time.
The SCH Pro-Drive high performance knife drive in conjunction with the uniquely simple SCH cutterbar system achieve cutting performances that had never been considered possible in the past, particularly in the case of self-propelled harvesters.
VIDEO: SCH Pro-Drive Knife Drive - Explained and In Action
Advantages of SCH Pro-Drive to conventional cutterbar knife drives
- Higher ground-travel cutting speeds
- Improved material flow with less reel work
- Low maintenance
- Minimal wear and easy service
- Less plugging with "reverse gear" not used as often
- Longer harvesting days, crops can be cut when there is dew on the ground
- Very easy knife change, remove two bolts for easy in-the-field changes
- Grease lubricated, eliminates the possibility of oil loss due to seal failure
Comparison of SCH Pro-Drive to conventional cutterbar knife drives
Almost all conventional cutterbar knife drives in combine harvesters have a knife stroke of between 3” and 3-1/3”. When a crop that is difficult to cut loads the cutting knife, the knife rarely travels the full length of the stroke. A considerable amount of the stroke is lost in deflecting gear housings, gear brackets, ball and socket joints and installed wobble boxes. Drives have been tested in which the stroke has fallen to 2-1/2” under load. The knocking and shaking this produces in the cutterbar is known to almost every expert in the field. It gives the impression that dull sections are being used.
The SCH Pro-Drive high performance cutterbar knife drive eliminates all these problems. Built using planetary gears, these drives produce an absolutely linear knife movement when compared with wobble boxes or other oscillating and pendulum drives. The gears are in exact alignment with the knife. This means there is no need for reversing or oscillating levers, which causes the loss of stroke in other drives. The full length of the stroke generated by the planetary gears is transmitted to the knife. The SCH Pro-Drive high performance knife drives can be driven either horizontally or vertically.
Changing knives with the SCH Pro-Drive
The engineers have devised a brilliant method of attaching the knifehead to the drive that is a major advancement. Designed as a trapezoidal claw, the connection is easy and accurate. No bolts to line up, no bearings to adjust or shim, no fear that dirt might get into bearings, bushings, etc. Makes changing knives even in the field a breeze.
Overstroke in the SCH Pro-Drive. The special construction of the planetary drive results in a precisely defined knife stroke. With a stroke of 85mm or 3-1/3” there is an overstroke of 4.4mm or 1/6” to either side.
All SCH Pro-Drive Conversion Kits Include:
- 1 - SCH Pro-Drive, vertical, 85mm (3.3") stoke
- 1 - mounting bracket for SCH Pro-Drive
- 1 - drive pulley for SCH Pro-Drive
- 1 - extra nylon ring for knifehead
- 1 - knifehead
Testimonial from Huron County, Michigan: “I bought an Sch ProDrive knife drive for my 1020 Header this spring. Put 500 acres on it and couldn't be happier. Ground Speed was faster by .5mph to 1mph even with worn out dull guards. I can’t wait to see what it will do with brand new knives and guards next fall.”