PowerMate
Operation Manua
Procedure for Repairing the M-Series Drive Screw Assembly
NOTE: Read all instructions carefully before attempting to make repairs to any part of the drive screw assembly.
Assembly
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 half-way. Disconnect the power supply
by way of the circuit breaker.
2. Refering to the Screw Assembly Drawings, remove
the two 1/4"bolts(22) and nuts(23). Proceed to
remove the brake cap (1), two bronze thrust washers
(2), steel washer(3), washer retainer(4), and brake
spring(5).
3. Drive out the 3/16"roll pin(7) taking care not to bend
the drive screw shaft. Place a suitable support
underneath the brake drive top washer(6)for this
operation.
4. Remove the brake drive top washer(6), two steel
thrust washers(8), thrust washer(9), brake drive
bottom washer(10), two bronze thrust washer(2) and
the steel thrust washer(11). NOTE: At this point, if it is
intended to replace the Bearing Overide or Ballnut,
complete those procedures first before continuing with
the brake reassembly.
5. As per the screw assembly drawing, replace the
brake assembly components (Brake Assembly Kit P/N
400150) in reverse as follows:
Items 2-11-2-10-8-9-8-6-7-5-4-2-3-2.
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 the brake cap(1) and insert the 1/4"bolts(22)
and fasten with the nuts(23).
Installation of Override Bearing Kit,
Ballnut or Screw Removal
NOTE: For this procedure, it will be necessary to
remove all accessories like skid plate, extended
toeplate, screw guard, strapbars, etc.
1. Remove the brake assembly as outlined in the
Brake Assembly Procedure.
2. Remove the motor guard. Loosen (remove if
necessary) the two bolts holding the motor support
to the mounting bracket. Pull the motor away from
the screw assembly to disengage.
3. Loosen the set screws(16) in the ballnut
locknut(15). Unfasten the locknut from the
ballnut(18). The outer frame and inner frame are
now disengaged.
4. Move the drive screw(19) enough to allow removal of
the override bearing components. Remove the
bearing retainer bar(12), two steel thrust
washers(11), thrust washer(9), 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 or
replacement, complete those procedures first before
continuing with the override bearing replacement.
5. As per the screw assembly drawing, replace the
override bearing components(Bearing Override Kit
PN 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 bar(12).
6. Guide the drive screw(19) back through the inner
frame top support and engage the spline coupling
(21) with the motor. Re-install the motor mounting
bolts but do not tighten. Reposition the outer frame
and/or ballnut so they engage through the ballnut
bracket leaving the unit extended approximately
halfway.
7. Thread the ballnut locknut(15) onto the ballnut(18),
but do not tighten.
8. Replace the brake assembly components as per the
Brake Assembly instruction step 5. Re-install the
brake cap(1) with 1/4"bolts and nuts(22/23) but do
not tighten.
9. Reactivate the electrical power through the circuit
breaker and operate the machine to full extension.
Push the motor/motor support towards the screw so
the skirt on the splined coupling(21) is 1/32" from the
motor. Tighten the motor mounting bolts.
10. Operate the unit to its fully retracted position. Tighten
the brake cap(1) bolts and nuts(22/23).
11. Tighten the ballnut locknut(15) to the ballnut(18),
hand tight only. Tighten the set screws(16).
NOTE: The ballnut must spin only when the unit is
run to its fully extended or retracted limits. If it does
not, adjust the tightness of the ballnut locknut.
12. Re-install the motor guard and strapbar(s). Re-attach
any removed accessories.
PN 010550 Rev.E
Eng. 05/ 06/ 14
5.03
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