I blew a hose and subsequently changed it. I used it for nearly two hours after the change but towards the end, the machine stopped going forward in forward. It would still push backward IN FORWARD!!! So fluid levels looked a bit low, I have topped them off. I have run the machine for a few hours, no go. Lifted the wheels off the ground and run for 20 minutes, no change. Any ideas? Can air have caused this and how do I remedy? If not, what's next? The hi pressure forward tubing inside the trans? Any help is appreciated...
1975 IH 3500A hydrostatic backhoe/loader - will not go forward!
- Thread starter jmsjolly
- Start date
- Views: 13998
blacklion66
Bronze Member
- Joined
- Nov 20, 2018
- Messages
- 61
- Tractor
- Bobcat CT230-Cat E110b Excavator-old Kioti 23 hp
you let air into the system when you replaced the hose
Keep your rpms in the working range 1500-2000
getting it out is fairly simple, start with the bucket and raise to the top and hole the lever in that location for a short minute, drop the bucket and keep the down press on for a short minute. Repeat this procedure 3-4 times
do the same with the backhoe keeping each cyl extended and retracted as with the bucket.
Your transmission if it still won't move, hold the pedal down forward and reverse much the same as with the bucket.
Everything by then should have started to improve, if better but still not right repeat the procedures.
If nothing got better time to talk with some who know's your machine
Keep your rpms in the working range 1500-2000
getting it out is fairly simple, start with the bucket and raise to the top and hole the lever in that location for a short minute, drop the bucket and keep the down press on for a short minute. Repeat this procedure 3-4 times
do the same with the backhoe keeping each cyl extended and retracted as with the bucket.
Your transmission if it still won't move, hold the pedal down forward and reverse much the same as with the bucket.
Everything by then should have started to improve, if better but still not right repeat the procedures.
If nothing got better time to talk with some who know's your machine
blacklion66
Bronze Member
- Joined
- Nov 20, 2018
- Messages
- 61
- Tractor
- Bobcat CT230-Cat E110b Excavator-old Kioti 23 hp
Is the backhoe and bucket working better or no improvement?
I understand hydraulics however when it comes to hydrostatic transmissions I'm a dummy even though I have two of them.
If the transmission was working the way it should before you replaced the hose, It has to be air.
However I found this link that perhaps you have already seen?
IH 35 A / 674 won't move - General IH - Red Power Magazine Community
I understand hydraulics however when it comes to hydrostatic transmissions I'm a dummy even though I have two of them.
If the transmission was working the way it should before you replaced the hose, It has to be air.
However I found this link that perhaps you have already seen?
IH 35 A / 674 won't move - General IH - Red Power Magazine Community
THANK YOU for that link - I am reading it now. I haven't been outside yet as it is pouring and ice, but I am going to go and plug the warmer in (it starts in about half a crank when I do that) and check the oil level again. I know it was pretty low after the hose issue and my high state of common sense awareness did not guide me to check the level right away. Yes, a dip****, I know... SO yesterday I got the level up, ran it and ran through some of what you suggested but did not do the number of iterations nor the hold at the top and bottom of each stroke. That I will try today.
BLACKLION 66 UPDATE: went out to backhoe, checked fluid levels again and it is low. no leaks anywhere that are observed. So I am thinking I am working the air out slowly with each running session. I ran to the store and added two more gallons. Will check the fluids again in two hours. BUT I did what you said with the hydraulics and all functions seemed to be getting smoother. I was EXCITED. However, the wheels are running backwards in reverse (GREAT!) and backwards in FORWARD(waaa waaa WAAAAA!). SO I am not sure if I did something permanent or I spit so much fluid and introduced so much air, I was lucky to complete the work i was doing. So I am duly humbled, I feel like a moron, and I am hoping not to have done damage to a perfectly good old backhoe. Your advice has made the machine better and I will continue this over the next few days/weekends until the levels equalize. Keep sending advice if you have more - I so appreciate it.
DLTTrekkers
Veteran Member
Most of my hydraulic problems I get comes from a sticky priority valve. Remove and polishing it always helps.
It's been a long cold dark winter and no improvement made on the backhoe. I ran it today for a couple hours with again, no improvement cycling through the hydraulics. It feels as though there might be air in there but that **** tranny just won't go forward.
blacklion66
Bronze Member
- Joined
- Nov 20, 2018
- Messages
- 61
- Tractor
- Bobcat CT230-Cat E110b Excavator-old Kioti 23 hp
Your problem seems to be very common.
One tractor that wouldn't move had a bad relief valve, another had some sort of safety valve with a broken lever, another with a pluged filter
You really need someone who understands hydraulics and hydrostatic transmissions to be there when you have the machine running. Very unlikely you caused any serious damage but anything is possible
sorry I can't help you more :confused3:
One tractor that wouldn't move had a bad relief valve, another had some sort of safety valve with a broken lever, another with a pluged filter
You really need someone who understands hydraulics and hydrostatic transmissions to be there when you have the machine running. Very unlikely you caused any serious damage but anything is possible
sorry I can't help you more :confused3:
The clutch must be depressed in order to shift forward to reverse - I wonder if the interlink has been damaged - the "never' you mentioned. I am looking into that now... I would love to actually USE this backhoe was it is half past May already.
UPDATE: Yesterday I had the time to remove the floor and the steering column protection. It looks like the cable between the shifter and the trans is the culprit. When shifting the mechanical linkage is not moving until I bypass the set screw on the column then there is a clunky shift. The good news is that the clunky shift made the vehicle go forward!!! The bad news is either the cable is bad or the linkage connection is bad. I am going to start with replacing the cable as it appeared to be separated behind the dashboard. Cross your fingers!!!
UPDATE!!! We have liftoff! The problem was narrowed down to the cable from the shifter on the column. The issue is the cable was unable to pull the lever/plunger into the trans to make it go into forward gear. I must have heated the trans up with low oil levels and effective "glued" the plunger into reverse post blown hose. PB Blaster and a lot of tapping loosened it to the point I could manually pop it up and go forward without the cable connected. NOW - I reconnected the cable and it still will not move the trans shifting lever and plunger so for the interim, I am going to add a manual "pull" to put it into forward. The regular shifter allows it to go into reverse easy peasy. Thanks for your feedback all this time... If anyone has any rube goldberg fix suggestions or permanent ones, I am all ears.
One final note - as older back hoe owners seem to know, irony is prevalent in their operation (so I am told). I go the unit going in forward and reverse and was overjoyed. Then, as soon as I went to use the dipper, I blew its hydraulic hose. All I could do was laugh.
One final note - as older back hoe owners seem to know, irony is prevalent in their operation (so I am told). I go the unit going in forward and reverse and was overjoyed. Then, as soon as I went to use the dipper, I blew its hydraulic hose. All I could do was laugh.
Here are some similar links:
