d7 3t Serial# 18330 filters

I would like some info on the oil filters, are there after market available if so what kind and numbers if not what is the stock numbers. Also after going through 250 pages of post i have learned that there is more places for oil than i knew about if any one has a diagram or something that shows locations and type of oils

Operators manual (OM) has a fold-out page that shows all the lubrication points and daily maintenance checks.

Almost all CAT machinery made during the 1950's used the same (NAPA 1161 or equivalent) full flow oil filters. This batch of machinery (the U series D2,D4,D6 for example) all were introduced with a bypass oil filter arrangement, but after only a few years, the full flow type was introduced on new machines and conversion kits offered for those already produced. I think your D7 would have two filter cannisters, so you need 2 filters. It's possible you will need the bypass type filter which has a washable screen on the outside of a replacable paper element.

Anything on the engine uses crankcase oil. 15-40 diesel engine oil is pretty common. If you can, use oil for older spec engines. The newer spec oil has less zinc additive. Oil clutch (if equipped) uses crankcase oil or a "drive train oil", steering booster uses crankcase oil or a hydraulic oil. Pony pinion clutch on the D7 is dry, there is a transmission there that uses oil though.

In the old days, and again now a days, Transmission/bevel gear case and final drives use gear lube with the weight depending on the operating temperature you will see. Generally a multiweight 85-140 will work great. At one time, CAT was allowing/recommending the use of 30 weight oil in everything, but that is no longer the case.

Track rollers are generally lubed for life these days, but you can take out plugs and add 30 wt oil through a spigot that is designed for the purpose or just squirt a little in. Unless the seals are out, they will take very little oil. the spigot is to fill them quickly and not overfill (leaves some air space). The plugs can be really hard to get out. Takes a good bit to turn them without shearing or shattering depending on the hardness of the steel.

If you have button head grease fittings somewhere, these are filled with track lube. Track lube is a very light grease 00 weight, most commonly available as "corn head" grease. A button head coupler is available at NAPA or other industrial supply. You want the one for "giant" button head fittings. The original CAT pumps for these fittings were a low pressure bucket type gun so you could 'feel' the resistance when the roller was full of grease and not blow the seals out. Most grease guns are very high pressure compared to the track lube pumps, and you must take care to not blow the seals ( or have the correct relief valve on the grease gun or coupler).