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.

[fou_bleu]

O.u.c.h!

[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!!!

[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.

[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).

[sleekism]

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

Do ships have a similar engine lifespan?

[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

[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?

[xwgasaxe]

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

[[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...

[irlewy86]

I don't know about the Cat.

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

[scottsbaxr8]

I have a mat ethat works in mines in Wa he sent me a pick of a ute that accidently got crushed, driver walked out. I will try and find and post

[Wokkas]

Originally Posted by J.C.

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

Nothing useless about that mate : . Great read.

[v8falconsrule]

I remember when I was a little tacker, they had an open day at the Tarong power plant. We saw the draglines, haul trucks and some of the inside of the plant and everything was HUGE! It was truely awe inspiring.

[Yaw]

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

[Green X]

CAT= Cheep A#$% Tractor LOL, Just kidding.

I got a Video of a MTUDDC 9000 sires V20 Quad turbo at idle on my phone, will try and upload it on the weekend it's big 52,000kg and worth a few million.

[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?

[cowboy]

Rig I'm on at the moment has 5 diesels rated at 6000HP each. 10 feet high by about 25 long.