GC 2600 Has anyone replaced the control valve line filter?
- Thread starter Dinico
- Start date
- Views: 988
DMW
Platinum Member
Seems like your using a decent semi-synthetic. Symptoms sound like overheating of the hydro fluid. Common causes would be damaged cooling fan (on GCs attached to driveshaft) or continuous pouring over the relief valve. Hydro whine is quite common, very noticeable when driving in high range. Should check the linkages for the 3pt lift and PTO to ensure they are shifting fully, and not getting hung up on anything. Off by a bit, they may produce no movement but allow oil flow over the relief valve or deadheading. When you have the tractor out, and you notice the whine, fiddle with the levers a bit, see if there is any change. Since you checked the solid lines, I assume they are not dented/bent.
I have witnessed a potential clue to what's causing my excessive hydro whine. But not really sure why it happening.
Today, when my daughter started mowing, I spend a few minutes walking behind the her listening to any noise changes. (She hates it, lol. Doesn't like someone standing over her shoulder. I wouldn't want me standing over my shoulder either. Haha)
Had her mow in rabbit and turtle, with and without 4WD, raise/lower FEL while mowing, raise/lower deck while mowing as I watched the eyeglass and listened. Hydro oil looked normal doing each. Fluctuations in eyeglass were normal. The whining sound stayed the same. But if I put pressure with my finger on the steel line that connects to the PTO engage lever, the whining is considerably quieter.
So, after about 30-40 minutes, had her stop and we took temps of hydraulic filter, lines, hydro pump, fittings, mower spindles, everything. It's good learning for her to know the tractor and diagnose any potential issues.
Nothing stood out as far as temps. Hydro pump was 135⁰F. Hydraulic filter 125⁰. Lines 110⁰-125⁰. Spindles and mower gear box was 105⁰-120⁰. Was about 80⁰ today. Hydro oil in eyeglass was at normal level. Point of reference(Normal level for my tractor is around 3-4mm above half with all pressure relieves from FEL and 3point hitch/deck)
She kept on mowing, I went to work in the garden. Sometime 15-30 minutes later she made a pass by the garden and I decided to follow and check the eyeglass.
At first glance from 10 foot away, it looked off, really cloudy. Had her immediately shut it down. Looking closer, it shimmered like if glitter was in the oil. (Slight panic and sickish feeling comes over me.) Now we are both on hands and knees, Sherlock Holmes like, describing to eachother what we are seeing. The shimmer was micro-bubbles. Slowly rising into a layer resembling foam and larger bubbles at the top of the eyeglass and a perfectly clear layer formed at the bottom as the air settled out. Within a few minutes, the oil was as clear as new oil and at normal level.
I checked all of the temps looking for an obvious hot part, connection, line, fitting, or area that may have caused the cavitation. Everything was the same temps as above. I even changed the batteries in the thermometer because I couldn't believe that the overall temps didn't increase.
No obvious leaks, so she drove it to the barn and I did a thorough check for anywhere that may be drawing air or leaking. Removed the deck. I even took the back wheels off to get a real good look.
Point of reference: I washed the tractor prior to changing the hydro filter, engine oil, fuel filter, air filter last week. Cleaned radiator screen, all the quick connects. I disconnected/reconnect the quick connects at that time too.
All control levers seem to full engage or disengage properly.
That's my rundown. Really appreciate everyone that has take the time to read this. Any advice or suggestions would be a blessing.
I'm think, replace the O-rings on the suction filter. Maybe the O-ring on the pickup tub to the hydraulic pump. I tightened the hose clamps on the jumper hose a couple of turns last week. Maybe replace the clamps and the hose. Possibly get some hydro oil dye and add it?
Could I be pulling in air and not having leaks?
Thanks
Today, when my daughter started mowing, I spend a few minutes walking behind the her listening to any noise changes. (She hates it, lol. Doesn't like someone standing over her shoulder. I wouldn't want me standing over my shoulder either. Haha)
Had her mow in rabbit and turtle, with and without 4WD, raise/lower FEL while mowing, raise/lower deck while mowing as I watched the eyeglass and listened. Hydro oil looked normal doing each. Fluctuations in eyeglass were normal. The whining sound stayed the same. But if I put pressure with my finger on the steel line that connects to the PTO engage lever, the whining is considerably quieter.
So, after about 30-40 minutes, had her stop and we took temps of hydraulic filter, lines, hydro pump, fittings, mower spindles, everything. It's good learning for her to know the tractor and diagnose any potential issues.
Nothing stood out as far as temps. Hydro pump was 135⁰F. Hydraulic filter 125⁰. Lines 110⁰-125⁰. Spindles and mower gear box was 105⁰-120⁰. Was about 80⁰ today. Hydro oil in eyeglass was at normal level. Point of reference(Normal level for my tractor is around 3-4mm above half with all pressure relieves from FEL and 3point hitch/deck)
She kept on mowing, I went to work in the garden. Sometime 15-30 minutes later she made a pass by the garden and I decided to follow and check the eyeglass.
At first glance from 10 foot away, it looked off, really cloudy. Had her immediately shut it down. Looking closer, it shimmered like if glitter was in the oil. (Slight panic and sickish feeling comes over me.) Now we are both on hands and knees, Sherlock Holmes like, describing to eachother what we are seeing. The shimmer was micro-bubbles. Slowly rising into a layer resembling foam and larger bubbles at the top of the eyeglass and a perfectly clear layer formed at the bottom as the air settled out. Within a few minutes, the oil was as clear as new oil and at normal level.
I checked all of the temps looking for an obvious hot part, connection, line, fitting, or area that may have caused the cavitation. Everything was the same temps as above. I even changed the batteries in the thermometer because I couldn't believe that the overall temps didn't increase.
No obvious leaks, so she drove it to the barn and I did a thorough check for anywhere that may be drawing air or leaking. Removed the deck. I even took the back wheels off to get a real good look.
Point of reference: I washed the tractor prior to changing the hydro filter, engine oil, fuel filter, air filter last week. Cleaned radiator screen, all the quick connects. I disconnected/reconnect the quick connects at that time too.
All control levers seem to full engage or disengage properly.
That's my rundown. Really appreciate everyone that has take the time to read this. Any advice or suggestions would be a blessing.
I'm think, replace the O-rings on the suction filter. Maybe the O-ring on the pickup tub to the hydraulic pump. I tightened the hose clamps on the jumper hose a couple of turns last week. Maybe replace the clamps and the hose. Possibly get some hydro oil dye and add it?
Could I be pulling in air and not having leaks?
Thanks
