Here in the states the engine in that model was the Waukashaw 155 & the hyd pump is on the intake/exhaust side of the engine(right side as seated on the machine).
There are no timing marks to worry about nor do the gears fall away once the pump is removed (again- as it's set up here in the states).
Send a picture to my email of that portion of the engine to make sure it's what I'm familiar with.
You mention trans oil- what does that have to do with this issue?
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