2014 - Volume #38, Issue #5, Page #24[ Sample Stories From This Issue | List of All Stories In This Issue | Print this story | Read this issue]
Articulated Oliver 88 Has 3 Drive Options
“I wanted to modify an 88 like this for a long time, but I needed the right parts,” says Schaefer. “When I finally had all the pieces, putting it together only took a few months.”
The “right” pieces included drives from 2 Oliver 40 combines and an articulation unit from an asphalt packer powered by an Oliver engine.
“I wanted drives from Oliver 40’s because they have a shaft from the engine forward through the transmission to the axle, and they would be geared the same,” says Schaefer. “The 3-wheel asphalt packer has a large front wheel that rocks both ways and turns. I figured it would make a good swivel plate to provide the articulation.”
Schaefer struggled for several weeks to figure out how to mount the packer wheel assembly. The vertical unit would articulate fine, but left no room for a driveshaft. One day when moving stuff around in his shop, the wheel assembly fell over.
“I looked at it on its side and realized that was how it needed to be mounted,” says Schaefer, with a laugh.
He started by jacking up the 88 and removing front and rear ends. A temporary angle iron frame between the 2 drives allowed Schaefer to start connecting the various components and leveling everything. It also reassured him that the cantilevered front end wouldn’t sag.
“I connected the driveshaft on the 88’s motor to the input shaft on the transmission for the first set of wheels,” says Schaefer. “After I had the swivel in place, I fabricated a driveshaft to connect the pto drive from the first to the input shaft for the transmission on the second rear end.”
Once he had all the shafts in place, as well as the swivel, he removed the angle iron, replacing it with heavy steel mounts between the swivel and the axles.
“I replaced the monster hydraulic cylinders on the swivel with heavy-duty, 3-in. Oliver cylinders,” says Schaefer.
Schaefer reversed the mount for the shift levers on the rear end. Normally they are designed to lean to the rear. Simply turning the levers around leans them forward enough for Schaefer to reach them from the driver’s seat. That is important, as both drives have to be in the same gear in 4-WD.
He mounted the hydraulic pump to the input shaft ahead of the rear-most transmission. It provides power to the hydrostatic steering as well as to auxiliary outlets on the rear of the tractor. Both the pto and the rear lift work on the 4-wheel 88.
The only real problem Schaefer has had is remembering which transmission is in gear. “I pulled up to the shed one day and put the front transmission in neutral,” he recalls. “As I started to get off, the tractor lurched ahead. The rear was still in gear.”
Contact: FARM SHOW Followup, Ollie Schaefer, 1006 Ridge Ave., Greenville, Ill. 62246 (ph 618 664-3050).
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