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How do I mount a final drive?

In this article we will explain what you should pay attention to when mounting a final drive. This article complements the video on mounting your final drive that you can find at the bottom of this page. It is not difficult to mount a final drive, but if you connect the motor incorrectly, you run the risk of causing irreparable damage to your final drive. Read this text carefully and you will be ready to get excavating in no time at all. These instructions assume that you have already unmounted the old final drive.

Unpacking and checking

Final drive in undercarriage

When you unpack your new final drive, check it right away for damage. We use very robust packaging for our final drives but it is possible for a final drive to become damaged during transport. It is better to discover this right away than after you have mounted the final drive.

Next, check whether there is sufficient oil in the final drive. Place the final drive onto its side with the filler plug on the top and the drain plug on the bottom. Unscrew the level plug. If oil comes out, there is sufficient oil inside the final drive. Then screw back the level plug. If no oil comes out, even if you tilt the final drive forwards by a couple of centimetres, you will have to top up the oil through the filler plug until oil seeps from the level plug. You can then screw back the plugs.

Exchange hydraulic couplings

Then you can undo the hydraulic couplings from the old final drive and mount them on the new final drive. Make sure that you mount them one at a time so you can be certain that the couplings have been fitted properly.

Cleaning

Use a wire brush to clean the contact surfaces on the machine. Wipe down the contact surfaces with brake cleaner so as to leave the surface clean and free from grease. You should also clean the bolts in the same way. When the bolts are clean, apply a thread-locking and sealing material to them such as Loctite 243. Clean contact surfaces and locking nuts ensure that the final drive will not come loose through vibration.

Mounting

Now you can hoist the final drive into the frame of the machine. Make sure that the final drive has been turned so that the ports point towards the hoses. Screw a couple of bolts through the frame in the final drive so that it is unable to fall from the frame. Now you can also screw the other bolts in the final drive. Tighten the bolts crosswise using the correct torque. The final drive comes with a mountation and maintenance manual. It has instructions on hoisting and a table showing the torques (in newton-metres - NM) that can be used for tightening the bolts.

electric final drives

Connection

Depending on the machine, there are two, three, four or sometimes even five hoses which have to be connected to the final drive. In any event, all final drives have A and B ports. These are the main lines that ensure that the final drive moves forwards and backwards. We always connect these first. You can recognise these because they are the thickest hoses.

  • Three hoses

None of the final drives in the Fargo Drives range can be connected with fewer than three hoses. If your final drive has two or three hoses, then it is a single-speed version. The third line is also called the drain line. This hose is thinner than the main line and it is used to control the return oil to the hydraulic oil tank. If your final drive only has two hoses, connect an extra non-pressurised line from the uppermost case drain port on the final drive to the tank.

In some cases, we may supply a final drive that can be used with one and two speeds. We sometimes provide these for a machine with three speeds. If you want to connect a final drive that also has a second speed while the machine has only one speed (which means that it has three hoses), the port from the second ground speed needs to be connected to the lowest case drain port. If this is the case, Fargo Drives will supply an appropriate hose set. Connect these carefully, otherwise you run the risk of causing irreparable damage.

  • Four hoses

The final drive is usually connected with four hoses. These are final drives equipped with two speeds. In this case, you have two main lines which are connected to the A and B ports, the drain hose that is connected to the uppermost case drain port and a hose for the second ground speed that is connected to the second port.

You need to pay careful attention here. The hoses for the second speed and the case drain port are similar in appearance. If they are connected incorrectly, this can cause irreparable damage to the final drive. If you are unsure about where you should connect each hose, carry out the following test. Once you have connected the A and B ports, place the two remaining hoses in a receptacle or bucket. Next, start the machine and operate the second ground speed. The hose from which the oil comes out is the hose that should be connected to the second speed port. The other hose is the drain hose that should be connected to the uppermost case drain port.

  • Five hoses

Final drives for which you need to connect five hoses are an exception. They are rare, but on Takeuchi excavators, for example, which are fitted with an automatic track tensioner, you will see five hoses connected. You should connect these in the same way as shown in the instructions for four hoses, however the fifth hose should be connected to the lower case drain port of the final drive.

Testing

Once you have connected all of the hoses and cleared up those oil residues, you can test everything. Start the motor and let the motor turn over. If everything runs properly, switch to the second speed, where applicable. If this works as it ought to and there are no leaks, you can fit the protective cover, sprocket and track once again. When you fit the sprocket, you should pay attention that you have also properly cleaned the contact surfaces and bolts again.

We have made a video about mounting your final drive, which you can find below. If you have any further questions after reading these instructions and watching the video, please contact Fargo Drives. We will be pleased to help you.

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