Procedure for Repairing the LE-Series Drive Screw Assembly
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, strap bars, etc.
PROCEDURE FOR DISASSEMBLY OF MACHINE
1. Place machine on a suitable work bench with the machine resting on its wheels
and rear handles (toeplate up). Activate the unit until the stairclimber is almost
fully extended and the load carriage is approximately in its mid position. De-
activate the unit using the circuit breaker.
2. Remove the screw guard and motor guard from the carriage inner frame.
Remove the ¼” bolts and nuts that secure the bearing retainer (item 12). The
carriage can now be removed by rolling off the top of the machine.
3.
Disconnect the wiring on the load carriage motor and remove the clips that
secure the guarded wire assembly to the outer frame. Pull this wire assembly our
through the hole in the outer frame. Remove the load carriage motor. Remove
the four bolts securing the toeplate to the outer frame. Remove the two ¼” bolts
and nuts securing the stairclimber screw assembly bearing retainer (item 12).
The outer frame assembly can now be removed by rolling it off the top of the
machine.
NOTE: The Screw assemblies for the Load Carriage and the stairclimber on both the
LE-1 and the LE-2 are all the same except for the Screw (length only) on the LE-2 Load
Carriage Screw Assembly.
BRAKE ASSEMBLY REPLACEMENT
1. With reference to the Screw Assembly drawing for the particular model, remove
the two ¼” bolts (item 23) and nuts (item 24). Proceed to remove the brake cap
(1), two bronze thrust washers (2), steel washer (3), 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 washer (11).
NOTE: At this point, if it is intended to replace the Bearing Override of 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:
Item# 2-11-2-10-8-9-8-6-7-5-4-2-3-2
5. 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).
6.
Install brake cap (1) and insert the ¼” bolts (22) and fasten with nuts (23). Go to
procedure for re-assembly of machine.
PowerMate
®
Operation Manual
PN 013550 Rev.D2
Eng. 12 / 12/ 12
5.03
