Help Wanted Digger Problems

Ex135

I have a Hitachi Ex135 digger which after an hours work gradually starts to get warm I was looking for any suggestions or help,
I have flushed coolant system
Changed thermostat
Reconditioned Radiator
Waterpump appears to be circulating
New air filters
New radiator cap.
I don't think its the temperature sensor as when i lift bonnet the gauge goes back to normal, the fan seems perfect and it doesn't appear to be the head gasket as is using no water what so ever.
Any help would be greatly appreciated,

wrangler

Ex135 wrote: »

I have a Hitachi Ex135 digger which after an hours work gradually starts to get warm I was looking for any suggestions or help,
I have flushed coolant system
Changed thermostat
Reconditioned Radiator
Waterpump appears to be circulating
New air filters
New radiator cap.
I don't think its the temperature sensor as when i lift bonnet the gauge goes back to normal, the fan seems perfect and it doesn't appear to be the head gasket as is using no water what so ever.
Any help would be greatly appreciated,

Is it only doing this since you put the rec radiator in, some don't be that well reconditioned.......surprising that it takes an hour to overheat

Ex135

No I put in the reconditioned rad thinking that would solve the problem, ya and the digger has to be going flat out as well. It has being bullet proof up to this.

patsy_mccabe

Are you sure the problem is in the engine and not the hydraulics ? Could the extra heat be coming from the hydraulic side.
You can generate a lot of extra heat in hydraulics if for example a pressure relief valve is constantly dumping.

Reggie.

Ex135 wrote: »

No I put in the reconditioned rad thinking that would solve the problem, ya and the digger has to be going flat out as well. It has being bullet proof up to this.

How did you flush the system. I think there is a certain way to do it. Sounds like the sensor to me

Ex135

patsy_mccabe wrote: »

Are you sure the problem is in the engine and not the hydraulics ? Could the extra heat be coming from the hydraulic side.
You can generate a lot of extra heat in hydraulics if for example a pressure relief valve is constantly dumping.

I never looked at the hydraulics, I suppose I assumed with hear I thought of the engine straight away, what would be the best way to go about diagnosing a hydraulic issue??

Ex135

Reggie. wrote: »

How did you flush the system. I think there is a certain way to do it. Sounds like the sensor to me

There’s stuff for it, drain the coolant and put in this with water and run it, surprising what comes out, there aren’t many sensors on the ex135 and it’s not temperature!

patsy_mccabe

I've worked a lot with industrial hydraulics but never with diggers. Is there a seperate cooling system for the hydraulics or is the engine and hydraulics cooled on the one circuit? Are there 2 seperate radiators?

Ex135

patsy_mccabe wrote: »

I've worked a lot with industrial hydraulics but never with diggers. Is there a seperate cooling system for the hydraulics or is the engine and hydraulics cooled on the one circuit? Are there 2 seperate radiators?

Ya there’s a seperate oil cooler beside the radiator.i blew it out as aswell just to be sure it was clear!!

fastrac94

U say the water pump is circulating but how do u know its circulating enough, some pumps have an impeller that wears down over time giving the symptoms u describe...

patsy_mccabe

Ex135 wrote: »

Ya there’s a seperate oil cooler beside the radiator.i blew it out as aswell just to be sure it was clear!!

It ain't the hydraulics so.

milligan2

Ex135 wrote: »

I have a Hitachi Ex135 digger which after an hours work gradually starts to get warm I was looking for any suggestions or help,
I have flushed coolant system
Changed thermostat
Reconditioned Radiator
Waterpump appears to be circulating
New air filters
New radiator cap.
I don't think its the temperature sensor as when i lift bonnet the gauge goes back to normal, the fan seems perfect and it doesn't appear to be the head gasket as is using no water what so ever.
Any help would be greatly appreciated,

Had a 75 that done the same and it turned out to be the insulation in the hood that had disintegrated and was messing with the air intake.
Run it with the hood open and see how you get on

Jeff2

Ex135 wrote: »

No I put in the reconditioned rad thinking that would solve the problem, ya and the digger has to be going flat out as well. It has being bullet proof up to this.

Long since I worked on this but if it needs to rev a lot to do work there could be air in the hydraulics system.

Liamsca

wrangler wrote: »

Is it only doing this since you put the rec radiator in, some don't be that well reconditioned.......surprising that it takes an hour to overheat

Hi I'm having the same problem with over heating.did you solve it thanks