When CATS go bad!

[Armageddon Designs]

We had one of the engines in one of our Cat 793C Haul Trucks go bang a few days back, got some pics of the remains, thought you guys might like them! There was a crack running the full lenght of the left side of the block. The pics are only off my phone so they don't do it justice!!! LOL

[GK351]

geez that spat the dummy pretty nicely.

How many km's did you get out of it?

[dave351cid]

looks very expensive $$$$$$$$$$$$$$$$$$$$$$$

[Nostalgia]

Holy crap. Thats nasty.

[Armageddon Designs]

The life of these engines isn't messured in K's, all done in Hours, but saying that not sure, I just saw it out in the yard waiting to be picked up and sent back to Westrac. I probably should have mentioned that it is a Quad Turbo V16 out of one of these!


All I can say is I'm glad I don't pay the bills for rebuilds!!! LOL!!!

[fou_bleu]

O.u.c.h!

[Lukeyson]

thats crazy

[Burnout]

That's another 'leg out of bed'
Would have been a nice bang!

[cowboy]

What mine do you work at mate? Ever see the video of a haul truck running over a landcruiser? Awesome.

[Armageddon Designs]

Originally Posted by cowboy

What mine do you work at mate? Ever see the video of a haul truck running over a landcruiser? Awesome.

Yeah seen that, makes you stop and think for a minute!!! LOL

I work at Newcrest's Cadia Valley Operation, just outside of Orange.

[XR6Dan]

Originally Posted by Armageddon

Yeah seen that, makes you stop and think for a minute!!! LOL

I work at Newcrest's Cadia Valley Operation, just outside of Orange.

Ha, I used to work there - well, next door at Ridgeway. Love the big trucks and shovels!! It's pretty humbling being in a landcruser and one of those suckers goes thundering past.

[gz1]

Having never seen an engine even close to this size it makes it hard for me to visualize exactly the scale. Do you have any pics that show the whole engine for reference?

[Armageddon Designs]

Originally Posted by XR6Dan

Ha, I used to work there - well, next door at Ridgeway. Love the big trucks and shovels!! It's pretty humbling being in a landcruser and one of those suckers goes thundering past.

Ha no way, small world! Where are you now? I went underground for a day over there and man what a 'different' feeling that is! Watched the bogger drivers come in from the ore passes to the crusher, man they move! Scary to watch them actually!

I hate it when we drive around the Haul Road to Ridgeway as we only have a 2x4 Hi-Lux ute!!! Feel really small!!!

GZ1 - I don't have any pics, I'll see if I can get some today, depends if they have gone out for repair or not, but I'm 6'2 and the engine units are taller than me!

[XR6Dan]

Originally Posted by Armageddon

Ha no way, small world! Where are you now? I went underground for a day over there and man what a 'different' feeling that is! Watched the bogger drivers come in from the ore passes to the crusher, man they move! Scary to watch them actually!

I was at Ridgeway from the construction of the underground ore handling and the stacker at Cadia - I think it was 2000-2001. During construction they trucked the ore and waste out - so driving down wasn't too bad as the trucks were pretty slow fully loaded and easy to avoid. But when you were coming up you really had to listen to the radio to find out what corner they were at as they were coming down as they went a lot faster. There was nothing worse then getting to a corner in an LV and met by a friggen big truck flying around the corner. Trying to reverse around a corner, down a steep slope, solid rock all around to get to the next passing bay, all the while being chased by a giant radiator with headlights was challenging.

These were Toro 50D's - 570 odd HP and a 60t payload.

[J.C.]

Generally, as mentioned previously, these are measured in running/machine hours. The life of an engine should be anywhere between 14500-17500hrs. Around this time time period is the most economical time for rebuild and by this stage the engine is starting to become sad anyway with blowby reaching the high side of the margin and cylinder heads leaking oil from under the spacer plate gasket.

The component hrs or the life of the component (engine) is also determined by fuel burn. The more fuel it burns during its life span, the more load, which in turn means more wear and component stress so the rebuild time comes around sooner so to speak ..... by rights. At least that's what Caterpillar are working on nowadays. So engine life can extend beyond the previously stated hrs.

The 793C came out with two engine arrangements. One is a 69L, V16 with four water cooled turbos in compound configuration (two high, two low pressure), water jacket aftercooled.
The other is a stroked version, high displacement, 72L, V16 with four water cooled turbos (non compound, two per bank), water jacket aftercooled. Both engine arrangements have SCAC (separate circuit aftercooling). Which basically means that the aftercooler circuit water has its own water pump, radiator (which is incorporated into the main radiator frame using the same cores as the engine jacket water to make up the full radiator arrangement at the front). The engine and aftercooler coolants do meet at the very top of the header tanks though. Top engine rpm is 1950, although have seen event histograms of 2400>. Continuous overspeeds during its life ends in something similiar to the above pics and premature failures.

These vehicles have a payload of approximately 220T, a top speed of 54-56kph, the trans are fully automatic with lockup in every gear except first (which is convertor drive then changes into lock up at a predetermined speed) and are stopped by the uses of wet (oil cooled), multi disc brakes.

There you have it. Some more useless trivia for AFF members.

Oh yeah! They also have traction control (which is disabled above a factory preset ground speed ....) and auto retard to try and limit engine overspeeds (I'm guessing that it wasn't working on this one or the operator was heading down the ramp flat with his foot on the gas just once to often..... hence the auto retard will not operate).

[tapeworm]

Originally Posted by J.C.

Generally, as mentioned previously, these are measured in running/machine hours. The life of an engine should be anywhere between 14500-17500hrs. Around this time time period is the most economical time for rebuild and by this stage the engine is starting to become sad anyway with blowby reaching the high side of the margin and cylinder heads leaking oil from under the spacer plate gasket.

The component hrs or the life of the component (engine) is also determined by fuel burn. The more fuel it burns during its life span, the more load, which in turn means more wear and component stress so the rebuild time comes around sooner so to speak ..... by rights. At least that's what Caterpillar are working on nowadays. So engine life can extend beyond the previously stated hrs.

The 793C came out with two engine arrangements. One is a 69L, V16 with four water cooled turbos in compound configuration (two high, two low pressure), water jacket aftercooled.
The other is a stroked version, high displacement, 72L, V16 with four water cooled turbos (non compound, two per bank), water jacket aftercooled. Both engine arrangements have SCAC (separate circuit aftercooling). Which basically means that the aftercooler circuit water has its own water pump, radiator (which is incorporated into the main radiator frame using the same cores as the engine jacket water to make up the full radiator arrangement at the front). The engine and aftercooler coolants do meet at the very top of the header tanks though. Top engine rpm is 1950, although have seen event histograms of 2400>. Continuous overspeeds during its life ends in something similiar to the above pics and premature failures.

These vehicles have a payload of approximately 220T, a top speed of 54-56kph, the trans are fully automatic with lockup in every gear except first (which is convertor drive then changes into lock up at a predetermined speed) and are stopped by the uses of wet (oil cooled), multi disc brakes.

There you have it. Some more useless trivia for AFF members.

Oh yeah! They also have traction control (which is disabled above a factory preset ground speed ....) and auto retard to try and limit engine overspeeds (I'm guessing that it wasn't working on this one or the operator was heading down the ramp flat with his foot on the gas just once to often..... hence the auto retard will not operate).

These things are awesome, do u know how much torque these engine make?

[[Tonko]]

Originally Posted by cboz

These things are awesome, do u know how much torque these engine make?

Yeah i'd like to know this aswell, kw/hp and torque...

[J.C.]

Originally Posted by cboz

These things are awesome, do u know how much torque these engine make?

I just read what I wrote and I made a mistake. The high displacement (stroked engine) is 79L and not 72 as I stated.

Here are some figures for you.
2300-2500hp at 1750rpm (with approx 35 psi boost)
8100-9300 ld/ft at 1300rpm

I think these figures are for the stroked engines.

[Wokkas]

Originally Posted by J.C.

There you have it. Some more useless trivia for AFF members.

Nothing useless about that mate : . Great read.

[Yaw]

Looks like an electrical problem....The distributor got knocked off the block by the conrod!

[sleekism]

No replacement for displacement.......................

Do ships have a similar engine lifespan?

[tex]

Originally Posted by sleekism

No replacement for displacement.......................

Do ships have a similar engine lifespan?

No. ship engines last much longer than that.

Ship engines max continuous speed is rated in hundreds of rpm ie 200 - 300rpm WOT and they burn bunker fuel.

Fuel usage for a ship is measured in tonnes per day, none of this nansy pansy lt per unit of distance...... There are examples of bunker fuel engines that have exceeded 100000 hours and are still in use.

Back to diesel engine life, I worked on a 25m fishing boat that had a Cummins 6BTcoupled to a gen set that had done 450000 hours. NO engine rebuild, no recondition, just a replacement turbo at about 28000 hours, plus regular proper servicing.

A truck driver that comes into my current work has a Star with a Cat 600 that will clock 1 million kms early next year. All it has had done so far is a replacement turbo - UNDER WARRANTY ! Plus, he reckons he will still be on the original clutch by the time 1000000kms is up.

[cowboy]

Thought they were full electric drive? I'm sure the ones I have been in were.

[J.C.]

Originally Posted by cowboy

Thought they were full electric drive? I'm sure the ones I have been in were.

Caterpillar are yet to release an electric drive rear dump truck (although I have heard it is on the board if not running around under test conditions). Other manufacturers such as Komatsu have electric drive trucks.

Caterpillar, to my knowledge, have always had mechanical drive rear dumps. From the 769 up to the mighty 797. All mechanical drive.

[cowboy]

Ahhh. That explains it them. All the ones I have been in were Komatsu.

[irlewy86]

Daylight in the engine block generally bad.

There goes $350,000 in rebuild.

[loxxr6]

My brother works for Westrac and we get pics pretty often of all the crashed/broken/etc trucks. They're always good value.

[DJM83]

Geez it really went bad there. Id love to see one of these things up close and personal just too see how big they really are

[xwgasaxe]

Terex mining also use GE electric motors for their drive. We supply the OE wheel seals for these.

[irlewy86]

I don't know about the Cat.

But Detroit 4000 series 1967 cubic inch (65l) V16 makes 2300hp (1715kw) at 1900 rpm.