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if you have a mack tri shaft box then check that the pto pump has been fitted to the correct hole. Some pto pumps run directly onto the counter shaft and others use an adaptor to increase the pump rpms or run from a larger gear in the box that runs the pump at higher rpms. . I suspect that the installation of the pump is incorrect and not in accordance with the fitting instructions for the pump.
Pto pumps fitted to road ranger box can be either on the side or underneath and each position connects with a different gear to drive it.
there is not info to be able to give a definite answer
to work it out
you have top know the diff ratio, wheel tyre circumference to be able to work from rpms of the engine to road speed
However as a pointer, most cars will be around 3200 rpms at 60mph as this will be direct drive and od causes a drop in rpms
Being an automatic find yourself a good section of low traffic road and start from stop slowly increase the rpms and watch the rpms. keeping the accelerator steady you will see when the auto changes by a drop in rpms. slowly increase road sped until you see the next drop in rpms and so on. Over drive normally comes in around 55 mph or around 3000rpms
I would think that it is working because 3500rpms at 75mph is reasonable rpms to be expected. If it wasn't working I would expect the rpms to be around 3800 to 4000.at 75mph
A small leak over period time will cause fault light (amber) to come on. There is no dipstick. Can only be refilled by dealer or certified Jag Mechanic. Cost of fluid at dealer $60. Quart. Check online; $15 quart
My 1999 Jag XJ8 did the same thing when the cruise control was activated (red button by the gear shift), but I wasn't actually using the cruise control. I deactivated the cruise control and the fail safe message no longer appears.
You will need to have your tranny rebuilt or get a replacement. As a mechanic myslef, I have seen this a few times in the Jag XJ series. Those people eneded up having tranny replaced as well.
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