RogerinIowa
Member
Looking at the TM for a 300 LGT, I think the 420 is similar, the charge pump draws oil from the bottom of the differential housing and up thru the filter before it gets to the pump.
Change the filter as it has possibly collapsed internally and blocking suction flow. Fill the filter as much as possilbe with oil before installing.
The only other "logical" place of flow restriction would be out of the bottom of the differential housing... May have to take the line off the bottom of the housing to see if oil will flow.
Repost if you find the problem as I have a friend with the same failure mode and his charge pump is okay too!
It would not let me post a reply below.
Change the filter as it has possibly collapsed internally and blocking suction flow. Fill the filter as much as possilbe with oil before installing.
The only other "logical" place of flow restriction would be out of the bottom of the differential housing... May have to take the line off the bottom of the housing to see if oil will flow.
Repost if you find the problem as I have a friend with the same failure mode and his charge pump is okay too!
It would not let me post a reply below.