Kioti 7320 powers shuttle hyd issues

[WV hayseed]

I have a new Kioti 7320 with cab and power shuttle and loader. Took delivery with 3 hours on the tractor. Episode #1. Dropped the 3 point to hook up a mowing machine and it would not raise. Well already it is trying to fight me. Un hook it and check everything and 3pt will not raise. Called dealer, said a valve may be stuck. I pick the arme up bu hand to the top and they start working. Hook back up to the mower and go trim. Next day hook to my discbine. Go mow 15 acres and all is fine. Episode#2. Change fields and re-engage discbine at 1200 rpm and pot slams in and kills tractor. Increase rpm and same result. Increase rpm same result. The only way to engage it was to keep bumping the switch and when it started to turn kick it off then back on until it would take it without killing the engine. Called dealer, he has never encountered that issue. Called Kioti and no adjustment on pot engagement. I said their has to be a solution. Episode #3. Mowing on steep ground I notice the steering getting knotchy, steering wheel turns, stops, turns again, stops, turns. All fluids are on the full mark. Called dealer, asked the hours, I said 11. Dealer said maybe a plugged filter or pinched hose. I checked hoses. All seem good. Gotta get my hay in so keep running tractor while dealer chases problem with Kioti. I change filters at 20 hours and drain just over 9 gallon of fluid out. Book says 15.9, but it is a Korean interpretation so was that actually gallons or liters, who knows. I put 10 gallon of Permatran semi synthetic (great fluid) back in. Fire it up and check for leaks. Shut it down and check level, it is on full. Proceed to run tractor same issues. Call dealer. He stated the rubber coupler on the suction line may be leaking air. Tightened it. Same issue. Drained fluid again. Replaced coupler with an industrial one and industrial clamps. Same issue. Continued to run tractor. Steering getting worse uphill or down hill it won't steer. Episode #3. While trimming uphill tractor ceases forward movement, no hydraulics to lift mower, nothing works on the hydraulics. Coast to level ground and it works again. Hydraulic fluid is on full mark. Dealer comes over and checks pressures. They are fluctuating. He drained fluid and replaced Orin's on suction line. Same issues. Replaced hyd pump. Worked fine for a few hours then started same pattern of issues, however, I did not let it progress and burn up a new pump. Dealer replaced filters and hyd fluid with his brand, 10 gal to the full mark. Same issues starting up again. Dealer called Kioti. They stated it need 16 gallon of fluid!! Dealer came and dumped in 6 more gallon! This put it 65mm above full. Still having a few issues but not as severe as before. I now have 126 hours on it and am not comfortable running that far over full.
Anyone else having this problem and how much hyd fluid is in your 7320??

 

[Tigershark]

Sorry for your problems, I think I would have tried to return it and asked for a new one at 11 hours. Sounds terrible

 

[Mugeye]

Got one three weeks ago . 46 hours now no real issues. But I’ll be up for my 50 hour service soon . Then will see. Keep us posted

 

[DieselBound]

If it's not operating correctly then don't take it back from them. I'd also have them put anything in writing that they do that puts ANYTHING out of specifications listed in the service manual. I'd then look to work the heck out of it to force it to break: operating within normal limits of course, but AT the limits. If it doesn't break and it does what you need (w/o causing any headaches) then that's what you want.

 

[RandyT]

I will say it is one of three things. Air leak on the suction side, restriction on the suction side (something rolling around someplace blocking oil inlet) or bad hydraulic pump. But that last one is not at the top of the list because of two separate pumps are being effected, so if not suction issue that I would guess restriction either in the transmission or between the transmission and pump inlet.

 

[WV hayseed]

Well I have a really good relationship with the dealer and he comes to my house for most repair attempts. He has had the suction side completely off the tractor and we inspected it. Also looked in the hole in the tranny, nothing obstructing. 3 sets of new filters.
I delivered it to him with his rollback for this last attempt. He adjusted the steering pressure, as it was set low causing a hard to steer issue with fel attached. I also bought a brush bucket with grapple from him and he plumbed that in for me. It is just odd that he has another 73 cab on the lot and we compared everything to it and they are identical. I told him I know it only has 10 gallon capacity to the ful mark in the trans as well. The same trans and dipstick on the 73 non cab and 66 non cab he has beside it. Frustrating! At least my tractor steers better now.

 

[WV hayseed]

Mugeye, please let me know how many gallons come out and how many you put back in to reach full mark.

 

[WV hayseed]

RandyT, I do work it. It was broken in pulling a 10 ft diskbine. Last 21 hrs has been brush hogging, and I don't mean mowing my yard. I am not as hard on it as I am my ole Hesston but it gets worked. I timber with the brush hog on the Hesston. Kioti needs a better seed screen on the front. I had to take a leaf blower to get all the crud out of the different coolers. I took a 5 gallon bucket of crap out from under the hood. I do take care of my tractors. When finished for the day they get cleaned and serviced.

 

[RandyT]

RandyT, I do work it. It was broken in pulling a 10 ft diskbine. Last 21 hrs has been brush hogging, and I don't mean mowing my yard. I am not as hard on it as I am my ole Hesston but it gets worked. I timber with the brush hog on the Hesston. Kioti needs a better seed screen on the front. I had to take a leaf blower to get all the crud out of the different coolers. I took a 5 gallon bucket of crap out from under the hood. I do take care of my tractors. When finished for the day they get cleaned and serviced.

I think you quoted the wrong person, I just said what I feel was the issue with the hydraulics. I didn't say you didn't work it, or abused it. Went back and reread you post about changing the hydraulic pump,

You also mentioned the 15.9 which I bet is gallons, since 16 liters is about 4 US gallon. So 16 gallon would be about right. I had issues with the hydraulic on my 45 a few years go after changing the fluid at 50 hours. After everything would get warmed up my loader would get jumpy and the steering would get hard to turn. Kept checking things and one day I pulled the dipstick for the hydraulic while the engine was running, and the oil was white but no water present in the oil and full of air bubbles. After shutting the tractor off, within a minute or two the oil would return to normal. Changed to another brand of oil and the problems went away. Basically the oil was foaming when hot

 

[WV hayseed]

Yes Sir sorry I got the wrong one. I don稚 have a foaming issue. It has had three different fluids in it. Original, Permatran semi synthetic and the dealer replaced it with Legacy. None of them produced foam. Just a very few bubbles at the worst.

I would just like to get it resolved. Great tractor if I can get this corrected.

 

[thorholt]

This is a copy-paste from the manual for my RX6010, same setup as 7320:
Hydraulic fluid in the implement line flows in the following order: filter (1) → pump (2) → main relief valve (6) → joystick valve (3) → remote hydraulic valve (4) → hydraulic cylinder (MLS valve)(5). If hydraulic fluid is used in a certain step, it cannot be used in the following step. For example, the remote hydraulic valve and lift cylinder cannot be used at the same time. Therefore, the remote hydraulic valve should be firstly checked if it is in neutral position if the lifting arm does not operate. Hydraulic pressure of the implement line is controlled by the main relief valve, which is installed to the joystick valve, to 185 kgf/cm² (18,130 kPa / 2,630 psi). Therefore, when pressure in the circuit rises over the relief pressure due to overload for the operation of the remote hydraulic valve, joystick valve and lifting cylinder, the relief valve is open to protect the circuit. When the engine is running at the rated speed (2,600 rpm), the primary gear pump with the capacity of 41.6 lpm is operated to supply hydraulic oil to the loader joystick valve (3), remote hydraulic valve (4), hydraulic cylinder (5), etc. mainly for tractor work. Hydraulic oil is firstly supplied to the loader joystick valve after passing through the oil filter and primary gear pump from the transmission case. When the joystick valve is operated, oil from the loader cylinder is returned to the transmission. When the joystick valve is not operated, hydraulic oil is supplied to the next component, remote hydraulic valve, through the carryover line in the joystick valve. This tractor is equipped with one double acting valve for the remote hydraulics. While the double acting valve is in use, the 3-point hydraulic cylinder, which is behind the double acting valve in the line, cannot be operated. When the double acting valve is not in use, hydraulic oil is supplied to the MLS valve through the carryover line to operate the 3-point link. When lifting the lifting arm, hydraulic oil is supplied to the lifting cylinder. When lowering or stopping the lifting arm, oil supplied to the valve and drained from the lifting cylinder is returned to the transmission case.

And for the secondary pump circuit, (Steering Pump)
The pump for the tractor operation (secondary pump) shares the oil filter (1) and suction line with the primary pump. The pump supplies oil to the steering unit (3) firstly. When the steering unit is in operation or the steering wheel is in the neutral position, hydraulic oil is supplied to the next component in order to operate other functions regardless of the steering system operation. The steering unit is equipped with the relief valve which opens to release pressure in case of load over 145 kgf/cm² in order to protect the hydraulic circuit. When hydraulic oil passes through the steering unit, it is supplied to the next component, modulator valve (4). The modulator valve supplies the PTO clutch, 4WD clutch, oil cooler(5), etc. with this hydraulic oil. The functions in the main section can be used simultaneously or separately, unlike the implement section. The sequence valve (6) shown in the circuit diagram increases the pressure where hydraulic fluid is branched to be supplied to the PTO clutch and 4WD clutch to utilize fluid supply to the PTO and 4WD. Also, if hydraulic pressure rises over 22~24 kgf/cm² by the sequence valve, the internal circuit can be damaged. The reducing valve (7) is to maintain hydraulic pressure to 17 ~ 19 kgf/cm². Hydraulic oil, flowing through the oil cooler from the modulator valve is returned to the transmission case. On the other hand, the sequence valve for the mechanical shuttle model uses spring tension and hydraulic pressure. When both 4WD and PTO are not in use, only 2 to 3 kgf/cm² of pressure is applied to the modulator, just enough to trigger the sequence valve to raise its opening pressure to 22~24 kg/cm². When either 4WD or PTO is used, hydraulic oil is supplied to the sequence valve through the pilot line (8) from the reducing valve and solenoid (PTO or 4WD), increasing pressure on the sequence valve to 22 to 24 kgf/cm² in order to supply a sufficient amount of hydraulic oil to the circuit. For this reason, the spring of the sequence valve has lower elasticity than the one of the reducing valve even though it controls higher pressure.

 

[marchanna]

Do the Lemon Laws apply to tractors? You might be able to get a new one.

 

[WV hayseed]

Thorholt thank you so much for the overvierw. Now I have even more questions. I am getting air in the loader circuit and clutch circuit(changing my pedal position) and the steering gets loud and notchy.

 

[spokane 1]

have you tried placing pressure gauges in several test ports on the hydro system.This will allow you to sense a pressure drop in a galley way or hose in multiple locations. Sometimes implement connections get dirt inside the quick connects or a rubber o-ring gets chewed up in the pump and is sent adrift in the system they (dirt) mostly get hung up inside quick disconnects. how does the PTO engage without a drive-line verse with a drive-line does it kill the engine when disconnected?

 

[WV hayseed]

Problem started when new so no dirt was there. The dealer and I have re-oringed and had basically all systems apart working on the tractor. The pressures have been repeatedly checked and adjusted. Initially they were fluctuating badly so the new pump was installed. The steering pressure had to be bumped up with the new pump. Last nite the main pressure was found to be a bit low so it was tweaked. The rear remotes and loader are now in spec again. I am getting ready to use it so we will see if this changed anything.
It is a small issue that affects about every component of the tractor! Pto sometimes is smooth and sometimes hits hard. Air in the system would explain all of the symptoms but where is it getting into the system? Especially since it is crossing the main/steering boundary and all they have in common is suction piping.

 

[RandyT]

I would think it would have to be something with the suction piping from where it connects to the bottom of the tranny, through the filter housing, and up to the pump.. Everything after that point would be pressure. Could there be something in that area that could be porous. Meaning allows air to be drawn in under vacuum but doesn't leak in a neutral environment.

 

[WV hayseed]

I have been seriously thinking of spraying everything with flexseal! I asked about a casting pore in the filter housing or a malaligned base letting airings the system. No change after the pressure adjustment. Still air in the system or at least symptoms of air in the system.

 

[countrybumpkin]

I'd be using a bore scope to look inside and through every pipe and fitting from the sump to the pump to see if there were any casting issues or blockages. Could be something blocking the sump outlet inside the trans housing.

 

[WV hayseed]

Already had everything apart tube goes into housing about 5". Looked at everything and it is clean as a whistle. Inside the housing is clear as well.

 

[WV hayseed]

My main complaint so far is the lack of online support for this tractor. I guess if I had no problem I would not need the support!