by ami-man »
Wed Jul 29, 2015 12:35 pm
Hi James,
Welcome to the forum.
Stripping down the gripper is an easy job.
First locate the two 1/4AF 4BA machine screws (one older 1100 mechanisms they can be Philips screws) that are in the flanges either side of the main mechanism casting. You do not have to complete remove these just enough to remove the two pegs that form the pivot point on each side of the trunnion casting.
Once these pegs/pins (sadly they are not listed in most of the manuals) have been removed you can pull out the assembly.
Note what way the Cam gear is around in its rest positon, if this is out 180 degrees this is why the gripper bow gear get stuck.
Now strip the gripper bow assembly completely and wash all the parts in warm water and washing up liquid, use a toothbrush to get any dirt or oil out of the gears.
Dry off completely and check the parts for any wear or breakage, the parts to check for wear are the Cam Gear (400-05013), Trunnion Gear (300-05122), Follower Cam (201-10815, note if this hasn't already been turned around put it back on with the good face nearest to the inner shoe), Roller (200-12537) check for flat spots on the roller,
Check the gripper bow (full name Transfer Arm & Hub Assembly 301-05197) to make sure the two flanges are not broken, if they are the grpper bow will not turn correctly to go back into the mechanism.
Reassemble after putting some high melting point grease in the two ends of the trunnion casting, refit the Pawl Lever and Shaft Assembly (201-12532). Now put the spring back onto the shaft of the Inner Shoe (201-10808) and put it through the trunnion casting the correct way is obvious because of the pawl lever and roller. Put the cam follower onto the inner shoe and tighten up the lock nut.
Put on the cam gear and trunnion gear and put back into the mechanism, the 2 pegs/pins will be harder to put back in because of the gease in the trunnion sockets, make sureyou agline the holes in the pegs to be in line with the retention screws.
Regards
Alan
Alan Hood
ami-man
UK