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JD 2755 no steering, no lift.

C

ccaissie

Member
Checked strainer, no blockage, no metal in oil. Recent main hyd filter. No oil to the front pump via the cooler. So it's a charge pump system issue.

What would be the next Dx step....I see all sorts of discussions on this and other forums.

Is this Hi Crop setup a different tractor than a 2750? I read horrible stuff about the 2750 hydraulics, yet some claim the 2755 is superior.
 

I forgot to state with hyd filter cover off bucket underneath to catch oil rotate engine crankshaft for 15 seconds & measure quantity of oil in bucket. Does your tractor have a frt end loader? If so what type valve controls it(scv or ind)? Does your tractor have options of hyd ind pto &/or hyd hi-lo?
 

Oil is supplied first to the pump up front , the cooler only receives surplus oil that the front pump does not use .
 
(quoted from post at 13:06:52 08/05/20)
Oil is supplied first to the pump up front , the cooler only receives surplus oil that the front pump does not use .
Click to expand...

Not exactly oil doesn't travel first to frt pump.

Trans pump supplies lubrication to trans gears/brgs then operates hyd functions such as hyd pto,hi-lo or reverser then excess oil is sent to frt pump
 
No charge oil to front hydraulic pump and if you have no two speed or PTO functions most likely you have a broken pipe at transmission pump
leaking into transmission reservoir. Not uncommon for a tractor this age and model. Nothing a split at transmission won't fix. You can remove
shift lever cover to pressure check this possible cause. One of the large pipes that plugs into shift cover will whistle when applying air
pressure to it confirming you have a big leak. Cover has to come off to get to the two bolt under it to split it anyway! Just as well check it
out. DW
 
(quoted from post at 15:29:22 08/05/20)
(quoted from post at 13:06:52 08/05/20)
Oil is supplied first to the pump up front , the cooler only receives surplus oil that the front pump does not use .
Click to expand...

Not exactly oil doesn't travel first to frt pump.

Trans pump supplies lubrication to trans gears/brgs then operates hyd functions such as hyd pto,hi-lo or reverser then excess oil is sent to frt pump
Click to expand...

Talking about up at the front . Oil is routed to the pump and what ever the pump does not use is pushed up into the cooler .
 
(quoted from post at 06:46:13 08/05/20) Checked strainer, no blockage, no metal in oil. Recent main hyd filter. No oil to the front pump via the cooler. So it's a charge pump system issue.

What would be the next Dx step....I see all sorts of discussions on this and other forums.

Is this Hi Crop setup a different tractor than a 2750? I read horrible stuff about the 2750 hydraulics, yet some claim the 2755 is superior.
Click to expand...

Check pressures with gauges to verify inlet pressure to front pump. The pump is not charged via the oil cooler. The cooler gets the excess oil from the pump.
 

Low pressure on that line from the transmission to the front pump , cooler , storage reservoir and line back to the trans sump .
No valves or restrictions .
 
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