D9G Transmission low pressure

Did you taper back the splined drive shaft of the new pump so that it didn't bottom out on the worn drive spline. Maybe if it bottomed out the gear has been driven into the pump face and badly scored it. This is a very common problem and mistake when fitting a new pump to an old machine.

Wombat

I got a mechanic to install the pump as I was out of town.

Picture of the old pump. The gear goes on the taper where the keyway is and held on with a nut and a split pin, and the transmission hole where it bolts in. 

Is there a procedure for this wombat? I guess I can take the pump off and check the distance between the face and the gear and compare it to the old pump. I'll check if there are measurements are in the book

If the pump was scored inside wouldn't the filter after it be full of metal?

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The splined pump shaft concern does not apply here as the transmission pump is gear driven.

If you had the bottom of the suction hose off and didn't lose all the oil in the transmission the suction screen in the transmission is plugged.
if the screen is plugged the pump seal may past air.
The hose needs 4 clamps on it.
If it's not a secret a serial number would help .
There are some real masters of the obvious on here.
Bob

No screen on this side. The D9G has 2 pumps, one for steering and brakes and one for direction and lube. The screen is on the Steering circuit.

The suction hose elbow bolts onto the front of the trans and there is 2 tubes that run all the way to the back and the pickup is in the bevel case 

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SN 66A01872

I'll see if i've got any more of the right hose clamps in the shed. Thanks

What you describe seems pretty normal for those early units except for the aerated oil. I would recommend using real gauges to do you testing rather than relay on iffy gauges. Yes there is no pre-screen protection for those early transmission pumps something that was added in the next series.
The only way I know to check a suspect hose is to remove and blank flange and pull or attempt to pull a vacuum.

OM is there an update to retro fit a screen for the pump? just a thought, (maybe it was in progress and only for the later model)

I don't see an update called out in the parts books but both suction tubes through the transmission are the same part number and either side used the same part number screen so I don't see any reason why you couldn't add the second screen.