Grease types
Submitted: Friday, Sep 03, 2004 at 15:55
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Member - Roachie (SA)
G'day all,
Up until recently I've been using an old grease gun with a black grease....think it's called Molybendum or something like that. This has been used for all sorts of jobs, primarily tail shafts and uni joints etc. GU's don't have any nipples on the steering linkages, so these can't be greased, unfortunately.
Recently replaced the bearings in the camper trailer and became aware that greaes ain't greases......bought a new fancy cartridge grease gun and some Penzoil bearing grease; red in colour.
Now I'm not sure whether I need to buy another cartridge of a different sort of grease for the drive line of the patrol, or could I use the bearing grease?
Any assistance will be appreciated.
Reply By: Peter 2 - Friday, Sep 03, 2004 at 18:37
Friday, Sep 03, 2004 at 18:37
Moly is usually used for greasing
suspension, driveline and steering components, High Temperature Bearing is used on the front of mainly 2wd's but should not be used on 4wd's or trailers as they tend to not get hot enough to melt the grease to lubricate the bearings.
For wheel bearings on trailers and 4wd's I use Catrol APX which is a very tacky grease that doesn't 'fling' away from the bearings.
For those that want to grease joints that aren't fitted with grease nipples you can fit nipples to some joints by removing a plug.
Most suburban 4wd owners wouldn't keep a vehicle long enough to wear a non greasable joint out.
If you intend to keep and use a 4wd for a long time maybe greasable components should be on a vehicle criteria checklist.
If torn boots on joints are not replaced quickly the joint will fail quickly due to water & dirt ingress especially if it is non greasable.
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Reply By: Member - Bradley- Saturday, Sep 04, 2004 at 16:59
Saturday, Sep 04, 2004 at 16:59
some easy points,
grease is best described as a base saturated in an oil, most common are lithium soap bases . Think of a sponge soaked in lubricating oil - thats grease, the base is there to hold the lubricating medium in contact with the moving surfaces.
Virtually all automotive greases are a NLGI 2 which means they are a 2 'weight' so you dont have to worry about that (range from 00 to 5). Colour doesnt mean a thing in the non moly greases - manufacturer choice only.
The dropping point refers to the temp at which the grease will drop off a surface so the high temp greases are usually tackier ( our moreplex grease for earthmovers is ridiculously tacky) and there are types for high moisture etc..
The moly greases which are the black types have a molybdenum disulphide additive for extreme pressure etc. DONT USE IN ROLLER BEARINGS. skf, timken etc say not to use moly grease in roller bearings as the moly builds up on the surface and causes the rollers to skid instead of rolling, therfore flat spotting the rollers. Experience has confirmed this to me also. If anyone is really interested i could burn a copy of some of our tech training on greases for them, just let me know. Greases aint greases, just as oils aint oils, btw my mob are the 2nd largest grease manufacturer in the world, over a thousand different types world wide!!
Roachie - best not to mix the 2 types, but you could grease until fresh grease is expelled and then short drive, repeat grease flushing, drive, grease etc.. until most of the moly is gone. Hope the above helps some, Brad
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