I had to this on my Series 3 109. The hub to axle seal had gone. EP90 axle oil was slowly seeping out and dripping onto the brake shoes. If the truck had been standing overnight they would be a slight pull to the opposite side the first time you braked the next day as the leaked oil was scrubbed off.
It wasn't a massively hard job. You stand back & think What was I worried about" when you have done it.
The seal wasn't too bad, just installed back to front by a previous owner. I found the hub was also cracked which didn't help either.
Here are some photos of the job.
This is how I did it. Always refer to the appropriate workshop manual for the correct procedure for doing this task.
First up wheel and drum removed. The drum was proving difficult to remove. This was helped by slackening off the manual shoe adjusters.
Drum with oil contamination. Cleaned off oil with White Spirit or similar. I took care not to breathe in brake dust as there may be some asbestos lingering from old pads.
Contaminated pads. Need to refit new ones.
One point, it is far easier to fit the new pads before you refit the hub after replacing the seal. It is possible after but is a bit of a bugg*r.
Next I removed the drive shaft flange from the hub to allow removal of the drive shaft and get access to the hub nuts. I did this by removing the six bolts shown here. I got a bit carried away and removed the drive flange from the driveshaft by removing the circlip but this is
not necessary.
Removing Drive Shaft Flange. Placed bowl under the hub assembly to catch any residual oil. This was also necessary when removing the hub.
Removing drive shaft.
To remove the hub from the stub axle it was necessary to bend the retaining tabs on the hub nut locking washer flat. I used a flat bladed screwdriver & long nose pliers. This allowed the hub nuts to be undone. When reassembling I used a new locking washer.
When reassembling I found that having done the hub nuts up to what I felt was the correct point, they became loose after a short drive so I had to dismantle it all again and tighten the hub nuts slightly. Some "settling" of the bearing may be occuring so next time I would take the vehicle for a short drive and then jack the vehicle & check for play in the wheel. Others on here may be able to advise on this.
Stub axle with hub removed.
The offending seal fitted back to front.
Having removed the seal I thought it would be a simple job of inserting the new seal, the correct way around and reassembling the whole lot. 45 minutes then home for tea & cake I thought, then I found this whilst cleaning the bearing seat up. The hub was cracked. I thought maybe I had been too brutal getting the old seal out but the slightly polished area around the crack implies it had been like that a while. I stopped taking photos at this point as I was a bit miffed. Reassembly when I got the new hub was simply the reverse of the dismantling process.
Two things I would do differently next time,
1) Fit the new brake pads before putting the hub back on
2) Check for play in the bearings after a short drive following reassembly of everything.