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Thread: Caterpillar 951

  1. #1
    Join Date
    Oct 2011
    Posts
    4

    Default Caterpillar 951

    I have just puchased a 951 and the decals on the side are different on each side one is 951B the other side is 951C does anyone know how to find out if it is a plain 951 or a 951C as I have been told? Also how do I tell from numbers what year it is? Also where are the numbers found? Also what is the best oil to put in the tranmission? as it has two dip sticks. 1. dip stick is in the floor in the cab. 1 is under the seat. Does it have to have a diverter valve for a ripper off of the 4 in 1 bucket lever.

    Loads of questions but any help would be appreciated. Thank you

  2. #2
    Join Date
    Oct 2010
    Location
    Lancaster, SC
    Posts
    41

    Default

    The dip stick under the floor plates are for the Trans. The one under the seat is for the steering clutch housing. Others can help out with type of fluid better than me.

  3. #3
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    8,518

    Default

    The 951B became the "C" model at 86J2598 (US built) when the 3304
    (78P) engine was introduced in 1973.

    I'm somewhat amazed that you'd buy a machine with s/n unknown.

    Need to get yourself some manuals and study up.

  4. #4
    Join Date
    Nov 2006
    Location
    London UK
    Posts
    193

    Default Serial #

    One serial number should be located on the left steering clutch housing,looking at the machine from the back,the other under the dash on the firewall just above the right steering /brake pedal,see the picture.
    Good luck with your investment.
    AJ
    Attached Images Attached Images

  5. #5
    Join Date
    Apr 2009
    Location
    Prather, CA
    Posts
    150

    Default

    I use 10-40W oil everywhere on my machine, engine and hydraulics. The ripper controler would be next to the rear of the RH arm rest, it's not part of the 3 levers for the 4in1 control. I'll try to remember to take a picture of it tonight to post on here.
    Scott

    1928 CAT 20, 1943 D42T - Military, 1942 Athey ForgeTrak - Military, 1975 951C, 1957 Oliver DDH

  6. #6
    Join Date
    Apr 2009
    Location
    Prather, CA
    Posts
    150

    Default



    I see my last post cracked the 100 Senior Member mark, I certainly don't feel senior (I'm only in my 40's) and I definitely consider myself in the junior knowledge category regarding Cats.

    Ok, back on topic.
    Scott

    1928 CAT 20, 1943 D42T - Military, 1942 Athey ForgeTrak - Military, 1975 951C, 1957 Oliver DDH

  7. #7
    Join Date
    Nov 2006
    Location
    London UK
    Posts
    193

    Default Oil's

    Cat changed the oil specs for all the powershift machines, the old oil spec of series 3 30W no longer applies,it has changed to TDTO 30W, (Transmission Drive Train Oil 30 weight) the page from original manual below states that all the oils except the hydraulics were SAE series 3 30W,the new spec oil is to increase clutch life.
    AJ
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  8. #8
    Join Date
    Oct 2011
    Posts
    4

    Default Caterpillar 951

    Thank you everyone for your help it is much appreciated

  9. #9
    Join Date
    Nov 2006
    Posts
    373

    Default 951 problems.

    Lucky for me, I can now class myself tricked up on things 951, if its a C the return to dig control is positioned at the end of the bucket tilt cylinder, thats the bit with the 4 bolts holding the cap in, it also has the 6. 91" track pitch, the plates look very wide, it also should be fitted with SALT chains, plus the loader turret should be heavily plated, with big chunks of Iron welded around the pin locations, the transmission oil cooler is in the radiator area rather than cooled just by water as the B series oil cooler that is bolted to the n/s of the engine, the water pump on the B is bolted on the top side of the gear set, on the C, its bolted into the front of the gear set, the B's have the scroll type injector pump, the C's have the sleeve style pump fitted, the scroll one is in my mind a better thing to have???, the weight of a B is a good bit lighter than the C, they both run the same nasty width pads that could just do with a bit more Iron to keep things afloat when it gets damp, the B is as good as a C in loads of ways, its lighter and is better on fuel, with a bit less HP to damage things, hope this is of some use, the B engine is the 330C, the C engine is 3304, lots of the bits are the same.

  10. #10
    Join Date
    Jan 2007
    Location
    devon uk
    Posts
    551

    Default

    Always a straight 30w transmission oil in any powershift transmission, do NOT use multigrade, the needle rollers bearings break the polymers down to the lower viscosity and causes excessive bearing wear. I've seen it, and the oil rep who reomended the 10w/40 oil would not help in the early hour failure!

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