Yardman T604H 46" cut..manual pto will not stay engaged

Try entering your model and serial number to find a manual. https://www.mtdparts.com/en_US/operatorsmanuals

When you say will not stay engaged you are saying that it comes on then cuts off ? If you turn on the PTO and it engages and the mower is not moving does the PTO stay engaged and for how long (if OK then need to check connections for PTO ) . If it is not engaging at all then we have to look at interlocks / safety switches . Give me some Details

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bad pto replace it

You can go to the Yardman website and download the service/owner's manual.

Did you take it out of reverse? You need too look closer at the linkage and at wear it gos, look for the switch on the trans mission, it going to work one of two ways positive or negative if it work from ground unplug it and see if it will work, if it doesn't try running a wire from one side of the connector to complete the circuit .

If you need further help, I’m available over the phone at https://www.6ya.com/expert/edward_020b3320326d263d

was it the right belt?is it to tight?

here is the manual bottom of page 16 and page 17, Good Luck Tim:

http://www.managemylife.com/mmh/lis_pdf/OWNM/99030004.pdf

The oil on your pulley could definitely be the culprit. You need friction in order for your belts to work properly.

Ranch King is a brand name of the manufacturer MTD.

Product manuals with part blow-up diagrams are available from MTD's web site,
http://www.mtdproducts.com/
Models are identified from the model number printed on a label under the mower seat.
The PTO and deck drive belts are shown on one diagram and the transmission drive belt is shown on another. The Form number on my printed Operator's Manual is 770-10526A (22HP, 46in cut) for Hydrostatic 817/818 models.

Parts can be ordered directly from MTD or other distributors on the web.

It is my experience that original brand name MTD belts work best.

The 22HP, 46" mower deck Ranch King Pro has 3 belts:

The drive belt which runs from the engine pulley back to the hydro drive unit to provide over-the-ground propulsion is part #754-0349.

A mower has either an electric PTO or a manual PTO, not both.

The electric PTO belt the provides power to the blade deck (runs around the electric clutch on the engine shaft (activated by electric switch, not the mechanical hand lever that engages the mower deck) is p/n 754-0476 for the 46" deck.

The manual PTO belt the provides power to the blade deck (runs off the pulley on the engine shaft (activated the mechanical hand lever to the left of the steering wheel that engages the mower deck) is p/n 754-0228 for the 46" deck.

The deck belt that goes around the 3 blade spindle assemblies on the mower deck, to drive the grass cutting blades is p/n 754-0349

In my experience, the PTO belt lasts about half a season, the other belts break about every other season when mowing 4 acres weekly.