1. Place machine on a suitable work bench with the
machine resting on its wheels and rear handles
(toeplate up). Activate the unit until it is extended
approximately halfway. Disconnect the power supply by
way of the circuit breaker.
2.
Remove four nuts retaining the toeplate to the outer
frame. Remove the two bolts and nuts fastening the
bearing retainer (12) and inner frame. The outer frame
can now be slid off the inner frame in the direction of
the handles.
1. With reference to the Screw Assembly drawing for the
particular model, remove the two 1/4"bolts(23) and
nuts(24). Proceed to remove the brake cap(1), two
disc spring washers(3), steel washer(8), washer
retainer(4) and brake spring(5).
2. Drive out the 3/16" roll pin(7) taking care not to bend
the screw shaft. Place a suitable support underneath
the brake drive top washer(6) for this operation.
3.
Remove the brake drive top washer(6), two steel
thrust washers(8), thrust washer(9), brake drive
bottom washer(10), two bronze thrust washers(2),
and the steel thrust washers(11).
NOTE: At this point, if it is intended to replace the Bearing
Override or Ballnut, complete those procedures
first before continuing with the brake re-assembly.
4. As per the screw assembly drawing, replace the brake
assembly components (Brake Assembly Kit P/N
400150) in reverse order as follows:
Items: 2-11-2-10-8-9-8-6-7-5-4-3-8-3.
During assembly, place a few drops of light machine oil
on the thrust bearing(9) only. Remember to support the
brake drive top washer(6) when installing the 3/16" roll
pin(7).
5.
Install brake cap(1) and insert the 1/4"bolts(23) and
fasten with the nuts(24). Go to procedure for re-
assembly of machine.
Procedure to Disassemble Machine
Brake Assembly Replacement
Override Bearing Assembly
1.
Remove the brake assembly as outlined in the Brake
Assembly procedure.
2.
Continue the disassembly by removing the two steel
thrust washers(11), steel thrust bearing(9), two plate
washers(13), and the urethane bumper(14).
NOTE: At this point, if it is intended to replace the Ballnut
or removing the Drive Screw for service/replacement,
complete those procedures first before continuing with
the override bearing replacement.
3. As per the screw assembly drawing, replace the
override bearing components (Bearing Override
Kit P/N 400160) in reverse order as follows:
Items: 13-14-13-11-9-11-12
Apply a few drops of light machine oil to thrust
bearing(9) and the roller bearing in the bearing
retainer(12).
4.
Replace the brake assembly components as per
the Brake Assembly instruction step 4.
Drive Screw Removal & Installation
1. Remove the brake assembly as outlined in the Brake
Assembly procedure.
2. Remove the override bearing assembly as outlined in the
Override Bearing Assembly procedure.
3.
Apply a band of tape around the drive screw(20) at each
end of the ballnut(19). This will prevent the ballnut from
disengaging the drive screw until the appropriate time.
The set screws(16) in the ballnut locknut(15) may be
loosened and the locknut removed. Remove the drive
screw(20) through the ballnut bracket(17) and remove
the spring disc washer(18) from the drive screw.
NOTE: At this point, if it is intended to remove the ballnut
(19) for replacement, complete the Ballnut Replacement
procedure first, before re-installing the drive screw.
4. To re-install the drive screw(20), place the spring disc
washer(18) over the ballnut thread, insuring the
concave side of the washer is oriented away from the
square body of the ballnut. Insert the drive screw(20)
through the ballnut bracket (17) as per the assembly
drawing. Thread the ballnut locknut(15) onto the
ballnut(19) but do not tighten. Remove the tape either
side of the ballnut, if applied.
5.
Continue the re-assembly process by returning to
step 3 of the Override Bearing Procedure.
NOTE: Read all instructions carefully before attempting to make repairs to any part of the drive screw assembly. Refer to the
Screw Assembly Drawing. For this procedure, it will be necessary to remove any accessories like an extended toeplate, screw
guard, strapbars, etc.
Procedure for Repairing the L-Series Drive Screw Assembly
PowerMate
®
Operation Manual
PN 011550 Rev.F
Eng. 12/ 09/ 20
5.03
