JD 2020 Power Loss

[thepumpguysc]

A- its not called a "drive coupler".. its a Flex Ring'
B- CAV pumps don't have them..
I think 2020 has keyed pump driveshaft.. either way u have to go thru the front..
Remove the 3 bolts holding the drive to the gear or the nut from the gear.. if its a nut, you'll need a puller to pop the gear off the pump shaft.
Some pump #'s will get u more information.

 

[SDavisH]

A- its not called a "drive coupler".. its a Flex Ring'
B- CAV pumps don't have them..
I think 2020 has keyed pump driveshaft.. either way u have to go thru the front..
Remove the 3 bolts holding the drive to the gear or the nut from the gear.. if its a nut, you'll need a puller to pop the gear off the pump shaft.
Some pump #'s will get u more information.

Pumpguy, are you saying I need to replace the flex ring on the pump drive shaft? Also, do I need to do anything with the timing before I remove the pump?

Below is a pic of the pump numbers

 

[Tx Jim]

Yes IIRC engine needs to be on #1 TDC before removing pump. I've read where IP needs to be disassembled in a dust free room & also where tech's have repaired them in a dusty field while using a pickup tailgate for a work bench. I've never been brave enough to disassemble an IP.

 

[SDavisH]

How do I find TDC on #1 on the compression stroke? The service manual says to manually turn the crankshaft clockwise. How do you do that?

 

[Tx Jim]

Remove bolt with pin(key 4) & cover from flywheel housing then reverse pin & insert in threaded hole. With timing widow on IP removed utilize a flywheel turning tool(special tool) or screwdriver inserted in ring gear teeth to turn engine over until lines inside IP align then pin should fit in depression in flywheel. ""Don't forget to remove pin from depression in FW after IP is installed!!""

 

[thepumpguysc]

The drive on that pump has a MASTER SPLINE it will only go on 1 way.. its almost foolproof.
U HAVE TO remove the cover infront of the pump to gain access to the 3-1/2" bolts holding the pump drive to the engine drive gear..
U don't have to worry about #1 cyl being on compression stroke..
"U CAN" remove the side cover on the pump, AFTER u shut off the fuel at the tank or pinch a rubber line..
& line up ANY of the letters in there w/ the flat on the timing clip..
It sounds like u don't have the special engine rotating tool, so you'll have to use a screwdriver on the flywheel or a 15/16{?} socket on the alternator..
I've never timed one before removing the pump.. they're fool proof.. only go on 1 way.. UNLESS u move the gear after the pump is off..
THERE IS a timing line on the OUTSIDE of the pump.. on the mounting "ear".. that lines up w/ some degree marks stamped into the engine block..
WRITE DOWN what # the timing line lines up with..

 

[Tx Jim]

thepumpguysc
Thanks for correcting my mistake. I left JD dealership back in '87 & I sure thought I was taught to put engine on #1 TDC before removing IP BUT A LOT OF WATER has run under the bridge & down the creek since '87.
thanks again,Jim

 

[SDavisH]

Thank you, Jim

 

[SDavisH]

Pumpguy, I see the timing line on the mounting flange of the IP and one on the timing gear cover, but they are not lined up. Do I just need to remember their orientation to one another or do I need to make a new mark on the timing gear cover? How do I figure out what part(s) to order for my pump and where can I order them from? Appreciate the help.

 

[thepumpguysc]

There should be a SET of marks.. degree marks.. or make your own..
"U" don't repair the pump..
You can click on my screen name on the left of the page for contact info..