Oil in the transfer case - what kind and how much to fill, how to check the level and condition

How often to change

There are several different types of transfer cases, and depending on the type of mechanism, the frequency of replacement can vary significantly. Usually this information is contained in the technical documentation for the car and varies in the range from 50 to 100 thousand kilometers.

In addition, operating conditions affect the service life. The transfer case of a car that drives on public roads experiences much less load than that installed on a car that constantly moves off-road.

How much oil does a KAMAZ 55102 engine need?

How much oil can be poured into a KamAZ engine

How to choose

Two types of fluid are poured into the transfer case: transmission oil or ATF fluid. On cars with an automatic transmission, ATF is usually filled into the transfer case, and on cars with a manual transmission, the transmission is filled. In this case, often the liquids must match or be completely compatible.

This is due to the fact that usually the connection between the transfer case and the gearbox is made by a single shaft, or one is attached to the body of the other. When mixing liquids, this will avoid the formation of emulsions, foaming and other side effects.

For most modern cars with a transfer case, the manufacturer recommends using GL-5 class gear oils. They protect hypoid gears well, are designed to operate in the most heavily loaded mechanisms and contain extreme pressure additives.

The viscosity characteristics of oils play an important role. Let's look at the meaning of the numbers using 80W90 oil as an example:

• 80 – viscosity at low temperatures
• W – all-season
• 90 – viscosity at high temperatures

If ATF is used, it is better to fill in the original fluid recommended by the manufacturer, or an analogue that has the appropriate approvals.

What and how much to fill

The table below will allow you to select oil by car brand and find out how much is required.

Bridges

Rear axle

1 — wheel drive gear; 2 — carrier cover; 3 - thrust ring; 4 - lock nut; 5 — bearing nut; 6 - roller bearing; 7 — rear wheel hub; 8 — drum brake; 9 — rear left brake; 10 — rear axle housing; 11 — left axle shaft; 12 — main gear; 13 — half-axis; 14 — fork of the locking mechanism; 15 — rod of the locking mechanism; 16 — piston of the locking mechanism; 17 — locking mechanism rod; 18 — driven gear hub; 19 — carrier with satellite casing.

Bridge average

1 — wheel drive drive gear; 2 — carrier cover; 3 - thrust ring; 4 - lock nut; 5 — bearing nut; 6 - roller bearing; 7 — rear wheel hub; 8 — drum brake; 9 — rear left brake; 10 — locking clutch; 11 — right axle shaft; 12 — rear shaft; 13 — drive flange; 14 — left axle shaft; 15 — middle axle housing; 16 — driven gear hub; 17 — carrier with casing and satellites; 18–center differential;