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Suggestion For IH 1586 Tractor That Loses Hydraulic Function
I have a suggestion for the Mississippi Case-IH service technician with the IH 1586 tractor that mysteriously loses hydraulic function despite replacing both pumps ("Mechanics Tell It Like It Is", Vol. 22, No. 2).
Two years ago my son, Earl, bought a used IH 3788 that appeared to have been well cared for but had
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Suggestion For IH 1586 Tractor That Loses Hydraulic Function TRACTORS Maintenance (45) 22-3-35 I have a suggestion for the Mississippi Case-IH service technician with the IH 1586 tractor that mysteriously loses hydraulic function despite replacing both pumps ("Mechanics Tell It Like It Is", Vol. 22, No. 2).
Two years ago my son, Earl, bought a used IH 3788 that appeared to have been well cared for but had had work on the hydraulic system. A new main pump had been installed to ensure there would be no further problems, the dealer told him.
When he got the tractor home, the hydraulic system performed perfectly in the yard. But when he hitched it to a 30-ft. grain drill and took it to the field, problems developed. If, for any reason, the clutch pedal was depressed to enable it to complete a lift or lower cycle, the remote cylinders stopped at that moment and he had to shift into neutral and re-engage the clutch to complete the cycle.
Earl took the tractor to our Case-IH dealer where the problem stumped mechanics. Finally, he happened across a mechanic who told him IH used a metal tube for an oil intake from the bottom of the oil reservoir and it was sealed at the other end by an O-ring in a groove. The O-ring shrank or became de-formed with use and, being above oil level, would then admit air which could cause the main pump to become air-bound. He said the clutch pedal on this tractor was hydraulic and required a quick surge of oil from pump # 2. The momentary suction of both pumps combined would roll the O-ring and permit a burst of air to enter the line and cause pump # 1 to cavitate, or lose its prime.
To solve the problem, he suggested adding another 5 gals. of oil to the system, saying the additional oil would do no harm and would cover the suspect O-ring. Earl added the extra 5 gals. of oil (above the full mark) and the trouble vanished until the tractor was operated on a sidehill. So he added 3 more gals. and the problem was completely eliminated. Cost was minimal compared with what it would have cost to split the tractor to re-place the 50-cent O-ring.
The IH 1586, with a pair of similar if not identical hydraulic pumps, may have the same ailment. (Louie Christensen, 12730 51st Street SE., Nome, N. Dak. 58062; ph 701 924-8877)
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