Mitek RoofTracker II Referenzhandbuch
MACHINERY DIVISION
MiTek Machinery Division
301 Fountain Lakes Industrial Drive
St. Charles, MO 63301
Phone: 800-523-3380
Fax: 636-328-9218
www.mitek-us.com
Part # and Rev. SB236
Date Printed 17 July 2018
Date Created 17 April 2018
Created By G. Gaia
Approved By M. Kanjee
Date Revised
Revised By
Applicability 67330-501, 67370-501
67390-501, 67490-501
Affected machinery:
RoofTracker™ III roller press
Document:
SB236
Title:
Replacing a Sprocket Locking Device on a Drive Shaft
Applicable Frame Numbers:
All RoofTracker III roller presses
Distribution:
Customers upon order
SERVICE BULLETIN
SB236
ORIGINAL INSTRUCTIONS 2 of 14
Purpose and Scope
The locking device on the gantry head holds the drive sprocket in place on the drive shaft.
Replacing the locking device properly is essential to avoid costly replacement of the
gearmotor.
This procedure explains how to remove a locking device and replace it with another
locking device.
The parts included in this kit are shown below. Please make sure all parts are present
before starting this procedure.
Table 1: Parts in SB236KIT
Before beginning the procedure, gather the supplies listed here:
If you have any questions, call MiTek Machinery Division Customer Service
at 1-800-523-3380.
Quantity Description Part #
1Service bulletin document SB236
1Locking device 547553
• Torque wrench capable of 7.4 ft-lb
(10 Nm) to 29.7 ft-lbs (40.3 Nm)
• Machine oil that does NOT contain
silicone or molybdenum sulfide
• SAE hex drivers and socket wrench
or SAE hex wrenches
• Sander or grinder
• 1-7/8'' combination wrench • Clean cloth or rag
• Calipers • Pliers
• Level • Paint pen
This procedure
maytakethreeto
five hours to
perform.
If you misplace
the screws for
the locking
device, order
M8–1.25 x
50mm ISO 4762
Class 12.9
socket head cap
screws from the
OEM.
SB236
ORIGINAL INSTRUCTIONS 3 of 14
Procedure
Electrical Lockout/Tagout Procedure
Before performing maintenance on any machine with electrical power, lockout/tagout the
machine properly. Follow your company’s approved lockout/tagout procedures, which
should include, but are not limited to, the steps here.
1. Engage an E-stop on the machine.
2. Locate the disconnect switch on the main electrical enclosure. Turn the disconnect
switch’s handle to the Off position. See Figure 1.
Figure 1: Removing Power from the RoofTracker III
3. Attach a lock and tag that meet OSHA requirements for lockout/tagout.
!WARNING
ELECTROCUTION HAZARD.
Even when the disconnect switch is off, there is still live power
supplied to the disconnect switch’s enclosure.
Always turn off power to the equipment before opening this
enclosure.
Main Electrical
Enclosure
SB236
ORIGINAL INSTRUCTIONS 4 of 14
Removing the Drive Chain
1. Go to the end of the gantry head opposite of the main electrical enclosure.
2. Remove the end guards highlighted in red in Figure 2 to access the drive chain.
Figure 2: End Guard Location
3. Check to see if the master link, circled in red in Figure 2, is accessible.
• If the master link is accessible, proceed to step 4.
• If the master link is not accessible, replace the guards, remove the lock and
tag, and move the gantry head slightly. Lockout/tagout again. Then repeat
steps 2 and 3.
4. Lower the mounting plate to reduce chain tension by using the following steps.
See Figure 3 for reference.
Figure 3: Mounting Plate
a) Turn the nuts highlighted in yellow in Figure 3 counterclockwise just enough
to break torque.
b) Turn the nuts highlighted in blue in Figure 3 clockwise until the mounting
plate moves just enough to remove tension from the chain.
5. Remove the master link. Remove the chain.
Mounting Plate
SB236
ORIGINAL INSTRUCTIONS 5 of 14
Identifying Your Locking Device
Removal instructions vary by model of locking device. Use Table 2 below to navigate to
the instructions that apply to your model.
Table 2: Locking Device Identification
Figure 4: Locking Device Identification
Number of Screws
in Locking Device
Manufacturer Removal Instructions
11 Tsubaki page 6
10 Fenner page 8
NOTICE
Do NOT use an impact driver at ANY point during this procedure.
Use of an impact driver damages the locking device and may lead
to equipment failure and costly parts replacement.
NOTICE
Do NOT reinstall a locking device more than one time.
Reinstalling a locking device more than one time may lead to
equipment failure and costly parts replacement.
Tsubaki Fenner
SB236
ORIGINAL INSTRUCTIONS 6 of 14
Removing a Tsubaki Locking Device
1. For reference, write the numbers of the locking holes on the sprocket. The screw
in locking hole 6 is the only screw that is not next to an unlocking hole. See
Figure 5.
2. Remove all of the screws from the locking holes by turning each screw 30 degrees
at a time in the pattern shown in Figure 5.
Turning more than 30 degrees at one time may damage the taper rings in the
locking device. Damaged taper rings may keep the locking device from
functioning properly.
Figure 5: Tsubaki Screw Removal Pattern
3. Lubricate five of the screws and all five unlocking holes. See Figure 5 for the
location of the unlocking holes.
4. Tighten the five lubricated screws in the unlocking holes by hand.
NOTICE
The lubricant should not NOT contain silicone or molybdenum
sulfide.
Lubricants with silicone or molybdenum sulfide may damage the
locking device.
Ifyouareremoving
a Fenner locking
device, see
page 8.
30º
= Unlocking
= Locking
SB236
ORIGINAL INSTRUCTIONS 7 of 14
5. Finish tightening the five screws by using the following guidelines.
• Tighten screws 30 degrees at a time in the pattern shown in Figure 6 until you
reach 30 ft-lbs of torque with each screw.
• Do not exceed 30 ft-lbs of torque with any screw.
• Do not tighten past the minimum distance indicated in Figure 7. Tightening
past this minimum distance may damage the locking device.
While tightening the screws, the torque should suddenly lighten twice. This
indicates that both taper rings are unlocked. If the torque does not lighten, repeat
step 5, but turn each screw less than 30 degrees at a time.
Figure 6: Tsubaki Unlocking Hole Location and Unlocking Pattern
Figure 7: Tsubaki Screw Tightening Distance
6. Once the taper rings have unlocked, remove the locking device and drive sprocket
from the drive shaft.
7. Proceed based on whether you are replacing or reinstalling a locking device.
• If you are replacing a locking device, retain the screws as spares and discard
the locking device. Skip to page 11.
• If you are reinstalling the existing locking device, retain the screws and
locking device. Skip to page 11.
= Unlocking
= Locking
30º
Minimum Distance = 0.47"
Cross Section
SB236
ORIGINAL INSTRUCTIONS 8 of 14
Removing a Fenner Locking Device
1. Remove all screws from their locking holes shown in Figure 8. Check the screws
and threads to make sure they are not damaged.
Figure 8: Fenner Screws in Locking Holes
2. Flatten the ends of five screws. Lightly chamfer the ends of the five screws so that
the screws have a slight taper.
Flattening and chamfering the screws prevents damage and allows you to
remove them from the clamp collars as you remove the locking device.
3. Place the five chamfered screws into the unlocking holes of clamp collar A.
Clamp collar A is identified in the cross-section view shown in Figure 9.
Unlocking hole locations are colored in light blue in Figure 9.
The unlocking holes of clamp collar A have threads near the front of clamp
collar A.
Figure 9: Fenner Clamp Collar A Unlocking Hole Locations
Ifyouareremoving
a Tsubaki locking
device, see
page 6.
= Unlocking
= Locking
Front
Collar B
Collar A
Collar C
Cross Section
ABC
SB236
ORIGINAL INSTRUCTIONS 9 of 14
4. Support the drive sprocket so that it does not tilt and deform the locking device.
5. Release the locking device by using the following steps.
a) Tighten screw 1 in Figure 10 a half of a turn.
b) Proceed to tighten each screw one half turn in the order shown in Figure 10.
After tightening all screws one full turn, clamp collar A may not appear to
have moved even though the screws may seem tight. This condition is
normal. Continue with the procedure.
Figure 10: Fenner Clamp Collar A Removal
c) Repeat steps a and b until clamp collar A comes free of the locking device
completely. Remove clamp collar A and the screws now inserted in it.
SB236
ORIGINAL INSTRUCTIONS 10 of 14
d) Remove the screws from clamp collar A.
e) Place the chamfered screws into the unlocking holes of clamp collar B.
Unlocking hole locations are colored in light blue in Figure 11.
The unlocking holes for clamp collar B have threads in clamp collar B.
Figure 11: Fenner Clamp Collar B Unlocking Hole Locations
f) Release clamp collar C by turning the screws one half turn at a time in the
pattern shown in Figure 12. When complete, clamp collar C disengages.
Figure 12: Fenner Clamp Collar C Removal
6. Remove the drive sprocket and clamp collars from the drive shaft.
7. Discard the locking device and the screws.
Front Cross Section
Collar B
Collar C
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