Re: Case 1070 transmission

Posted by Chris J. on November 22, 2004 at 17:41:51 from (142.161.204.57):

In Reply to: Case 1070 transmission posted by Lenny on November 18, 2004 at 09:01:26:

After writing my first post I looked in the 1070 Case Service Manual and discovered that a sliding gear type transmission is used rather than a collar shift design (most tractors use the collar shift type). The advantage of sliding gear design is simplicity, the downside is gear changes involve sliding the gears along a splined shaft with the gear teeth that drive the tractor doing the actual engagement. If an operator grinds/rips gears excessively , it will over time damage the sides of the gears, reducing their overall width with a proportionate reduction in load capacity plus metal shavings of hardened steel end up in the bottom of transmission case and oil. This damage unless extreme would rarely however require that parts be replaced.
The design uses 2 shifter forks that move 2 sliding gearsets that have 3 positions each.
One shift fork gives you 1st--neutral--3rd range. The other shift fork gives you 2nd--neutral--4th range. To engage any of the 4 range selections one shift fork must always be in neutral position while the other in its appropriate gear position.
Your current problem is caused by both shift forks being out of neutral at the same time, engaging 2 ranges at the same time causing the transmission to lock. The forks move along two shafts each with three notches cut in corresponding to each shift position. A steel ball under spring pressure moves over these notches (detents) to maintain each position. With proper adjustment, moving the gearshift forward and backward you should feel each detent engage in each of the 3 positions on each side of the H shift pattern . The neutral detent positions must be inline with the side the side movement of the shifter. If the neutral detent is not capable of holding this position the fix would be to increase spring pressure on steel ball or to grind slightly deeper notch in shaft or weld and grind shaft if worn at notch or to replace worn parts.

Unless a gear in the transmission has a broken tooth (very unlikely), it should be possible to repair without any or very little disassembly, some adjustment and almost no cost except time.

Follow Ups:

• Re: Case 1070 transmission Lenny 06:24:19 11/24/04 (0)

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