86LikesHpi Pro 4
03-01-2004, 10:01 AM
#1951
Re: diff slippage
Originally posted by chr15tophe
infact looking at the manual closer, the drawing shows 5 thrust balls in the diagram to build it, the part number shows x6 on the left hand side of the page and beside the pic of the thrust race it shows 6 balls with part number A150..
How many have people used in theres then??
infact looking at the manual closer, the drawing shows 5 thrust balls in the diagram to build it, the part number shows x6 on the left hand side of the page and beside the pic of the thrust race it shows 6 balls with part number A150..
How many have people used in theres then??
03-01-2004, 10:03 AM
#1952
The US manual shows 6 in the picture, and x6 on the side. 
03-01-2004, 10:16 AM
#1954
Tech Adept
6
03-01-2004, 10:18 AM
#1955
yep glued the ring in, might have possibly come unstuck will check, i have 6 thrust balls also
03-01-2004, 04:16 PM
#1958
i also found typos in the ball diff instructions.
the part #A157 2.4mm balls should be used inside the ball differential.
while, #A150 2mm balls should be used with the diff screw
the part #A157 2.4mm balls should be used inside the ball differential.
while, #A150 2mm balls should be used with the diff screw
Last edited by racer; 03-01-2004 at 04:23 PM.
03-01-2004, 04:25 PM
#1959
scan of instructions
03-01-2004, 06:33 PM
#1961
Tech Adept
freeing up the pro 4 drive train
I just got my pro 4 built and noticed the heavy steal input shafts used.. Has anyone tried any thing to free up the drive train? Has anyone been able to get parts yet?
03-01-2004, 07:42 PM
#1963
The PRO 4 drive train should be very free straight out of the box. If it isn't check to make sure none of the shims are bent. Especially the 3 large shims in the rear gear box. The only adjustment I made to mine while building the car was in the front gear box. Instead of 2 shims on one side of the one way diff, I used a single shim on each side. And I applied a very light coating of the included white cap "diff" grease on the gears as stated in the manual. My car spins very free and it runs very quiet. Even though I took a few decent sized hits, I did not break any parts while racing it this past weekend at the Winterfest race at Trackside.
03-01-2004, 07:51 PM
#1964
I used 6 thrust balls.
No problems with the diffs in any form, running brushless.
Have added 1 extra large shim to rear g/box
No problems with the diffs in any form, running brushless.
Have added 1 extra large shim to rear g/box
