Dorner Aqua Pruf 7400 Ultimate Series User manual

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DORNER MFG. CORP. INSIDE THE USA OUTSIDE THE USA
P.O. Box 20 • 975 Cottonwood Ave. TEL: [phone] TEL: [phone]
Hartland, WI 53029-0020 USA FAX: [phone] FAX: [phone]
Installation, Maintenance and Parts Manual
851-620 Rev. A
7400 Ultimate Series
End Drive Conveyors
Flat Belt Conveyor

Dorner Mfg. Corp. 2 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Table of Contents
Introduction ......................................................................... 2
Warnings – General Safety.................................................. 3
Product Description............................................................. 4
Specifications ...................................................................... 4
Flat Belt 7400 Series Conveyor ................................... 4
Cleated Belt 7400 Series Conveyor ............................. 4
Conveyor Supports....................................................... 5
Installation........................................................................... 6
Required Tools................................................................. 6
Recommended Installation Sequence.............................. 6
Conveyors up to 10 ft (3048 mm).................................... 6
Stand Installation.......................................................... 6
Tail Assembly Installation ........................................... 7
Drive Tail.................................................................. 7
Tip Up Idler Tail....................................................... 7
Nose Bar Tip Up Tail ............................................... 8
Lifter Installation........................................................ 10
Wear Strip Installation ............................................... 10
Belt Installation .......................................................... 11
Belt Return Installation .............................................. 12
Conveyors Longer than 10 ft (3048 mm) ...................... 13
Preventive Maintenance and Adjustment.......................... 14
Required Tools............................................................... 14
Checklist ........................................................................ 14
Cleaning......................................................................... 14
Routine Cleaning........................................................ 14
Standard Conveyors................................................ 14
Conveyors with Tip Up Tails and Lifters............... 14
Periodic Cleaning....................................................... 15
Lubrication..................................................................... 15
Conveyor Bearings..................................................... 15
Wearstrips and Belt Returns .......................................... 16
Maintaining the Conveyor Belt...................................... 16
Troubleshooting ......................................................... 16
Conveyor Belt Replacement ......................................... 16
Conveyors with Guides............................................... 16
Standard Belts............................................................. 17
Replacing a Section of Belt..................................... 17
Replacing the Entire Belt ........................................ 17
Specialty Intralox 1100 Series Belts........................... 18
Replacing a Section of Belt..................................... 18
Replacing the Entire Belt ........................................ 18
Specialty Intralox 1600 Series Belts........................... 18
Replacing a Section of Belt..................................... 18
Replacing the Entire Belt ........................................ 19
Conveyor Belt Tensioning ...................................... 19
Sprocket and Puck Removal........................................... 20
A - Drive Sprocket Removal ...................................... 20
B - Idler Puck Removal .............................................. 21
Reassembling Tail Assembly......................................... 22
Tip Up Idler Tail......................................................... 22
Drive Tail.................................................................... 24
Bearing Replacement ..................................................... 26
Service Parts....................................................................... 27
Drive End Components .................................................. 27
Tip Up Tension End....................................................... 29
Nose Bar Tip Up Tension End ....................................... 30
Conveyor Frame and Extension ..................................... 31
3" (76 mm) High Sides................................................... 32
Cleated 1" (25 mm) Guides............................................ 33
Cleated 3" (76 mm) Guides............................................ 34
Flat Belt Returns............................................................. 36
Cleated Belt Returns .......................................................36
Flat Belt.......................................................................... 36
Cleated Belt.................................................................... 36
Ordering a Replacement Chain ...................................... 36
Belt Removal Tool ......................................................... 36
Configuring Conveyor Part Number ............................. 37
Return Policy...................................................................... 38
Upon receipt of shipment:
• Compare shipment with packing slip. Contact factory
regarding discrepancies.
• Inspect packages for shipping damage. Contact carrier
regarding damage.Accessories may be shipped loose.
• See accessory instructions for installation.
Dorner reserves the right to make changes at any time
without notice or obligation.
Dorner has convenient, pre-configured kits of Key Service
Parts for all conveyor products. These time saving kits are
easy to order, designed for fast installation, and guarantee
you will have what you need when you need it. Key Parts
and Kits are marked in the Service Parts section of this
manual with the Performance Parts Kits logo .
Intralox is a registered trademark of Laitram L.L.C. in the
United States and / or other countries.
Introduction
CAUTION
Some illustrations may show guards
removed. DO NOT operate equipment
without guards.
NOTE
Proper conveyor application, cleaning, and
sanitation are the responsibility of the end
user.
The Dorner Limite Warranty applies.
Dorner 7400 Series conveyors have patents pending.

851-620 Rev. A 3 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Warnings – General Safety
DANGER
SEVERE HAZARD!
KEEP OFF CONVEYORS. Climbing, sitting,
walking or riding on conveyor will result in
death or serious injury.
DANGER
EXPLOSION HAZARD!
• DO NOT OPERATE CONVEYORS IN AN
EXPLOSIVE ENVIRONMENT. The electric
gearmotor generates heat and could ignite
combustible vapors.
• Failure to comply will result in death or
serious injury.
WARNING
CRUSH HAZARD!
• DO NOT place hands or fingers inside the
conveyor while it is running.
• DO NOT wear loose garments while
operating the conveyor. Loose garments
can become caught up in the conveyor.
• Failure to comply could result in serious
injury.
WARNING
CRUSH HAZARD!
• SUPPORT CONVEYOR SECTIONS PRIOR
TO LOOSENING STAND HEIGHT OR
ANGLE ADJUSTMENT SCREWS.
• Loosening stand height or angle
adjustment screws may cause conveyor
sections to drop down, causing serious
injury.
WARNING
SEVERE HAZARD!
LOCK OUT POWER before removing guards
or performing maintenance. Exposed moving
parts can cause serious injury.
WARNING
BURN HAZARD!
DO NOT TOUCH the motor while operating,
or shortly after being turned off. Motors may
be HOT and can cause serious burn injuries.
WARNING
PUNCTURE HAZARD!
Handle drive shaft keyway with care. It may
be sharp and could puncture the skin,
causing serious injury.
WARNING
SEVERE HAZARD!
• Dorner cannot control the physical
installation and application of conveyors.
Taking protective measures is the
responsibility of the user.
• When conveyors are used in conjunction
with other equipment or as part of a
multiple conveyor system, CHECK FOR
POTENTIAL PINCH POINTS and other
mechanical hazards before system start-
up.
• Failure to comply could result in serious
injury.

Dorner Mfg. Corp. 4 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Product Description
Refer to (Figure 1) for typical conveyor components.
Figure 1
Flat Belt 7400 Series Conveyor Cleated Belt 7400 Series Conveyor
* Refer to “Ordering and Specifications” Catalog for details.
Typical Components
1 Conveyor
2 Belt (Flat Belt Shown)
3 Return
4 Support Stands
5 Drive End
6 Tension End
1
2
3
5
4
6
Specifications

851-620 Rev. A 5 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Specifications
Conveyor Supports
Figure 2
Specifications
Maximum Distances:
1 = 3 ft (914 mm)
2 = 8 ft (2438 mm)**
3 = 3 ft (914 mm)
** For conveyors longer than 10 ft (3.05 m),
install support at frame joint.
1 2 3
Conveyor Width Reference (WW)06 – 36 in 02 increments
Conveyor Belt Width 6" (152 mm) – 60" (1524 mm) in 2" (51 mm) increments
Maximum Conveyor Load 20 lb / ft2(97 kg / m2) with a maximum of 1000 lb / ft2(4882 kg / m2)
Belt Travel 12" (305 mm) per revolution of pulley
Maximum Belt Speed 233 ft / minute (71 m / minute)
Belt Take-up 2" (51 mm)
Conveyor Length Reference (LLL)036 – 999 in 001 increments
Conveyor Length 36" (914 mm) – 999" (25.4 mm) in 1" (25 mm) increments
IMPORTANT
Maximum conveyor loads are based on:
• Non-accumulating product
• Product moving toward gearmotor
• Conveyor being mounted horizontally
• Conveyor being located in a dry environment
• Conveyor equipped with standard belt only

Dorner Mfg. Corp. 6 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Installation
Figure 3
Required Tools
• 17 mm wrench (for hexagonal head fasteners)
• 4 mm hex wrench (for bearing shaft assembly fasteners)
• Level
• Torque wrench
Recommended Installation
Sequence
1. Attach the stands to the conveyor. Refer to “Stand
Installation” on page 6.
2. Attach the tail assemblies to the frame. Refer to “Tail
Assembly Installation” on page 7.
3. Attach the lifters, if applicable. Refer to “Lifter
Installation” on page 10.
4. Install the gearmotor, if applicable. Refer to the “7400
Series Drive Package Installation, Maintenance and
Parts Manual.”
5. Attach the wear strips. Refer to “Wear Strip Installation”
on page 10.
6. Install the belt. Refer to “Belt Installation” on page 11.
7. Attach the belt returns. Refer to “Belt Return
Installation” on page 12.
8. Attach any guides / accessories. Refer to the "Service
Parts" section starting on page 27.
Conveyors up to 10 ft (3048 mm)
Stand Installation
Typical Stand Components (Figure 4).
Figure 4
1. Position the stands on a flat, level surface.
2. Attach the stands to the frame (Figure 5).
CAUTION
Dorner recommends cleaning all the “food
zones” prior to placing conveyor into
service. Ensure adequate access is provided
for cleaning and servicing equipment so that
the required level of hygiene can be
maintained.
NOTE
Proper conveyor application, cleaning, and
sanitation are the responsibility of the end
user.
CAUTION
Conveyor MUST be mounted straight, flat,
and level within confines of conveyor. Use a
level (Figure 3, item 1), during setup.
1
1 Conveyor frame
2Stand
3 M10 - 1.5 x 16 mm hex head cap screws (x4)
1
2
3

851-620 Rev. A 7 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Installation
Figure 5
Tail Assembly Installation
Drive Tail
Typical Drive Tail Components (Figure 6)
Figure 6
1. Slide the bearing shafts (Figure 7, item 1) into the take
up blocks (Figure 7, item 2).
Figure 7
2. Install the drive package, if applicable. Refer to the
“7400 Series Drive Package Installation, Maintenance
and Parts Manual.”
3. Insert the pull pins (Figure 8, item 1).
Figure 8
Tip Up Idler Tail
Typical Tip Up Idler Tail Components (Figure 9).
1 Drive tail assembly
2 Pull pin (x2)
3 Conveyor frame
1
3
2
1 Tip up tail assembly
2 Pull pin (x2)
3 Tip up shaft
4 Key stops (x2)
1
2
1

Dorner Mfg. Corp. 8 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Installation
Figure 9
1. Slide the tip up shaft (Figure 10, item 1) through the
designated slots in the frame.
Figure 10
2. Attach the key stops (Figure 11, item 1) to the tip up
shaft (Figure 11, item 2). The rounded end of the key
stop should be facing the tail.
Figure 11
3. Slide the bearing shafts (Figure 12, item 1) into the
holes in the tip up shaft (Figure 12, item 2).
Figure 12
Nose Bar Tip Up Tail
Typical Nose Bar Tip Up Tail Components (Figure 13).
Figure 13
1. Slide the tip up shaft (Figure 14, item 1) through the
designated slots in the frame.
2
1
4
3
1
1
2
NOTE
Do not insert the pull pins on the tension end
of the conveyor until the belt has been
installed.
1 Tip up tail assembly
2 Pull pin (x2)
3 Tip up shaft
4 Key stops (x2)
12
3
2
4
1

851-620 Rev. A 9 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Installation
Figure 14
2. Attach the key stops (Figure 15, item 1) to the tip up
shaft (Figure 15, item 2). The rounded end of the key
stop should face the tail.
Figure 15
3. Attach the nose bar idler shaft hands (Figure 16, item 1)
to the tip up shaft (Figure 16, item 2).
Figure 16
4. Attach the nose bar transfer post (Figure 17, item 1) to
the nose bar idler shaft hands (Figure 17, item 2).
Figure 17
5. Ensure that the nose bar pucks (Figure 18, item 1) are
in line with the conveyor frame (Figure 18, item 2).
Figure 18
1
1
2
1
2
NOTE
Do not insert the pull pins on the tension end
of the conveyor until the belt has been
installed.
2
1
2
1
180˚

Dorner Mfg. Corp. 10 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Installation
Lifter Installation
Typical Lifter Components (Figure 19).
Figure 19
1. Slide the belt lift pivot bar (Figure 20, item 1) through
the designated holes in the frame. The pins on the pivot
bar should be located to the inside of the frame side
rails.
Figure 20
2. Attach the lifter bars (Figure 20, item 2) to the belt lift
pivot bar (Figure 20, item 1). Make sure the hooked
ends of the lifter bars are facing down when resting
against the frame.
3. Attach the lifter handle (Figure 20, item 3) to the belt
lift pivot rod.
Wear Strip Installation
Typical Wear Strip Components (Figure 21).
Figure 21
1. Position the wear strips (Figure 22, item 1) on the
frame.
Figure 22
2. Make sure the wear strips are situated securely in the
frame slots (Figure 22, item 2).
1 Belt lift pivot bar
2 Lifter bars
3 Belt lift handle
4 M8 - 1.25 x 16 mm hex head cap screw
3
2
1
1 Wear strip
1
1
2

851-620 Rev. A 11 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Installation
Belt Installation
Typical Belt Components (Figure 23).
Figure 23
1. Position the belt on the conveyor frame (Figure 24).
Figure 24
2. Wrap the belt around the conveyor, making sure the
sprocket teeth have engaged the belt.
3. Bring the ends of the belt together (Figure 25).
Figure 25
4. Insert the belt rod (Figure 26, item 1).
Figure 26
5. Push the belt rod in as far as possible.
6. Lightly tap the head of the rod with a hammer until it
snaps into position.
7. Extend the tension end to remove excess slack in the
belt (Figure 27). Reference figure 32.
Figure 27
1 Chain belt
2Beltrod
1
2
1

Dorner Mfg. Corp. 12 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Installation
8. Insert the pull pins (Figure 28, item 1) on the tension
end of the conveyor.
Figure 28
9. If no more travel is available, remove one or more belt
links to take up the tension. Refer to “Standard Belts:
Replacing a Section of Belt” on page 17.
Belt Return Installation
Typical Belt Return Components (Figure 29).
Figure 29
1. Attach the chain return shoes (Figure 30, item 1) to the
return shaft (Figure 30, item 2).
Figure 30
2. Slide the return shaft (Figure 31, item 1) up and
through the large slot (Figure 31, item 2) in the frame
(picture shown without the belt or wear strips).
Figure 31
3. Push up on the return shaft (Figure 31, item 1) and slide
the notched end of the shaft through the small slot on the
opposite side of the frame.
1 Return shaft
2 Chain return shoe
1
1
2
1
2
1
2

851-620 Rev. A 13 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Installation
4. Check belt sag by measuring from the top of the return
(Figure 32). Belt sag should not exceed 4" (102 mm).
Follow steps 7 – 9 in the “Belt Installation” section on
page 11 to remove slack from the belt.
Figure 32
Conveyors Longer than 10 ft
(3048 mm)
Typical Connection Components (Figure 33).
Figure 33
1. Locate the section number sequence etched on each
section of frame (Figure 34, item 1).
Figure 34
2. Position the frame sections in the correct order.
3. Connect the frame sections by bolting the hex post
connectors (Figure 35, item 1) between frame sections.
Be sure O-rings are seated properly on hex post and hex
screws prior to tightening of screws to avoid damage to
O-rings.
Figure 35
4. Follow the installation process described in “Conveyors
up to 10 ft (3048 mm)” starting on page 6.
CAUTION
Belt sag should not exceed 4" (102 mm) from
the top of the returns.
1 M10 x 1.5 mm hex head cap screws (x4)
2 Connector hex rods (x2)
3 Conveyor frame
4 O-rings (x8)
(102 mm)
Up to 4"
3
4
1
2
CAUTION
Avoid damage to O-rings. Be careful not to
pinch or cut them.
1

Dorner Mfg. Corp. 14 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
Preventive Maintenance and Adjustment
Required Tools
• 17 mm wrench (or adjustable wrench)
• 4 mm hex wrench (for bearing shaft assembly fasteners)
• 3 mm hex wrench
• Punch and hammer (to remove belt rod)
Checklist
• Keep service parts on hand. Refer to the "Service Parts"
section starting on page 27 for recommendations.
• Replace any worn or damaged parts.
Cleaning
Routine Cleaning
Dorner recommends cleaning the inside and the outside of
the conveyor on a daily basis. Refer to the following steps to
access the inside of the conveyor.
Standard Conveyors
1. Remove the guides, if applicable, by removing the pull
pins (Figure 36, item 1) that connect the guide (Figure
36, item 2) to the frame.
Figure 36
2. Tip up idler tail assembly (Figure 37).
Figure 37
3. Lift up on the belt (Figure 38).
Figure 38
Conveyors with Tip Up Tails and Lifters
1. Remove the guides, if applicable, by removing the pull
pins (Figure 36, item 1) that connect the guide (Figure
36, item 2) to the frame.
NOTE
Proper conveyor application, cleaning, and
sanitation are the responsibility of the end
user.
WARNING
SEVERE HAZARD!
LOCK OUT POWER before removing guards
or performing maintenance. Exposed moving
parts can cause serious injury.
1
2

851-620 Rev. A 15 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
2. Use the lifter handle (Figure 39, item 1) to raise the
lifters (Figure 39, item 2) and raise the tip up tail
(Figure 39, item 3).
Figure 39
Periodic Cleaning
Dorner recommends complete disassembly of the conveyor
periodically for thorough cleaning.
For conveyor disassembly and reassembly instructions:
• Refer to “Conveyor Belt Replacement” on page 16.
• Refer to “Sprocket and Puck Removal” on page 20.
• Refer to “Reassembling Tail Assembly” on page 22.
Lubrication
Conveyor Bearings
Conveyor bearing lubrication is required. Dorner
recommends using an H-1 food grade grease.
1. Add grease to the bearing using the zerk fitting (Figure
40, item 1) on the exterior of the bearing shaft assembly.
Figure 40
2. Replace the bearings if they become worn.
CAUTION
DO NOT submerge or soak bearing
assemblies. This will reduce the life of the
bearing.
NOTE
Although bearings are sealed, re-greasing is
recommended to increase bearing life. An
H-1 food grade grease is recommended. The
frequency of bearing re-greasing is
dependent upon the application in which the
conveyor is being used. Frequency of re-
greasing will increase with the frequency of
conveyor washing.
3
2
1
1

Dorner Mfg. Corp. 16 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
Wearstrips and Belt Returns
Replace the wearstrips and belt returns if they become worn.
For wearstrip and belt return installation instructions:
• Refer to “Wear Strip Installation” on page 10.
• Refer to “Belt Return Installation” on page 12.
Maintaining the Conveyor Belt
Troubleshooting
Inspect conveyor belt for:
• Surface cuts or wear
• Skipping
Damage to belt links or rods, surface cuts and / or
wear indicate:
• Sharp or heavy parts impacting belt
• Jammed parts
• Accumulated dirt
• Foreign material inside the conveyor
• Improperly positioned accessories
Skipping indicates:
• Excessive load on belt
• Worn sprockets or impacted dirt on drive pulley
Damage to belt links or rods indicate:
• Excessive load on belt
• Dirt impacted on sprockets
• Excessive or improper side loading
• Improperly positioned accessories
Conveyor Belt Replacement
Conveyors with Guides
1. Remove the pull pins (Figure 41, item 1) that connect
the guide (Figure 41, item 2) to the frame.
Figure 41
2. Remove the guide (Figure 42, item 1).
Figure 42
3. Follow the belt replacement procedures described in
“Standard Belts” on page 17, “Specialty Intralox 1100
Series Belts” on page 18, or “Specialty Intralox 1600
Series Belts” on page 18.
NOTE
Visit www.dorner.com for complete list of
troubleshooting solutions.
WARNING
SEVERE HAZARD!
LOCK OUT POWER before removing guards
or performing maintenance. Exposed moving
parts can cause serious injury.
1
2
1

851-620 Rev. A 17 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
Standard Belts
Replacing a Section of Belt
1. Tip up idler tail assembly (Figure 43).
Figure 43
2. Secure the retaining head side of the belt. Use the belt
removal tool (Figure 44, item 1) for 1" pitch belts. For
all other belts, position the section of belt so that it is
braced by the flanged puck (Figure 44, item 2).
Figure 44
3. Use a punch and hammer to push the belt rod out by
striking the rod end opposite the retaining head (Figure
45).
Figure 45
4. Remove the belt rods on both sides of the section of belt
being replaced.
5. Replace the old section with a new section of belt.
Replacing the Entire Belt
1. Remove the belt returns by pushing up on the return
shaft (Figure 46, item 1) and sliding it through the large
hole (Figure 46, item 2) in the frame.
Figure 46
2. Lower the opposite end of the return shaft (Figure 46,
item 1) and slide it out of the frame.
3. Follow steps 1 – 3 in "Standard Belts: Replacing a
Section of Belt" on page 17.
4. Remove the belt.
CAUTION
Secure the retaining head side of the belt
prior to removing a belt rod in order to
prevent damaging the belt.
21
CAUTION
DO NOT reuse belt rods that are damaged or
show signs of wear.
1
2

Dorner Mfg. Corp. 18 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
5. Replace the damaged or worn belt. Refer to “Belt
Installation” on page 11 and “Belt Return Installation”
on page 12.
Specialty Intralox 1100 Series Belts
Replacing a Section of Belt
1. Place the edge of a flat head screwdriver between the
the two belt links and turn clockwise (Figure 47).
Figure 47
2. Use a second belt rod of the same size to push on the
opposite end of the belt rod. (Figure 48).
Figure 48
3. Remove the belt rods on both sides of the section of belt
being replaced.
4. Replace the old section with a new section of belt.
Replacing the Entire Belt
1. Remove the belt returns by pushing up on the return
shaft (Figure 49, item 1) and sliding it through the large
hole (Figure 49, item 2) in the frame.
Figure 49
2. Lower the opposite end of the return shaft
(Figure 49, item 1) and slide it out of the frame.
3. Follow steps 1 – 2 in "Specialty Intralox 1100 Series
Belts: Replacing a Section of Belt" on page 18.
4. Remove the belt.
5. Replace the damaged or worn belt. Refer to “Belt
Installation” on page 11 and “Belt Return Installation”
page 12.
Specialty Intralox 1600 Series Belts
Replacing a Section of Belt
1. Lift up on the belt to gain access to the underside
2. Use a flat head screwdriver to raise the end of the belt
rod above the retention lip (Figure 50).
Figure 50
CAUTION
DO NOT reuse belt rods that are damaged or
show signs of wear.
1
2

851-620 Rev. A 19 Dorner Mfg. Corp.
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
3. Remove the bet rod by gripping the end with a set of
pliers and pulling (Figure 51).
Figure 51
4. Remove the belt rods on both sides of the section of belt
being replaced.
5. Replace the old section with a new section of belt.
Replacing the Entire Belt
1. Remove the belt returns by pushing up on the return
shaft (Figure 52, item 1) and sliding it through the large
hole (Figure 52, item 2) in the frame.
Figure 52
2. Lower the opposite end of the return shaft (Figure 52,
item 1) and slide it out of the frame.
3. Follow steps 1 – 2 in "Specialty Intralox 1600 Series
Belts: Replacing a Section of Belt" on page page 18.
4. Remove the belt.
5. Replace the damaged or worn belt. Refer to “Belt
Installation” on page 11 and “Belt Return Installation”
page 12.
Conveyor Belt Tensioning
1. Remove both pull pins (Figure 53, item 1). Place tip up
idler tail in the down position (Figure 53, item 2).
Figure 53
2. Extend the idler tail to the next groove (Figure 53, item
3) on the bearing shaft.
CAUTION
DO NOT reuse belt rods that are damaged or
show signs of wear.
1
2
WARNING
SEVERE HAZARD!
LOCK OUT POWER before removing guards
or performing maintenance. Exposed moving
parts can cause serious injury.
CAUTION
Belt sag should not exceed 4" (102 mm) from
the top of the returns.
1
32

Dorner Mfg. Corp. 20 851-620 Rev. A
7400 Ultimate Series End Drive Conveyors
Preventive Maintenance and Adjustment
3. Continue extending the tension end until the belt is
sufficiently tight (Figure 54). Reference figure 32.
Figure 54
4. Reinsert the pull pins.
5. If no more travel is available, remove one or more belt
links to take up the tension. Refer to “Replacing a
Section of Belt” on page 17.
Sprocket and Puck Removal
1. Remove the conveyor belt to access the sprockets /
pucks. Refer to “Conveyor Belt Replacement” on
page 16.
2. Remove the desired sprocket / puck by following these
instructions:
• A - Drive Sprocket Removal
• B - Idler Puck Removal
A - Drive Sprocket Removal
1. Loosen the button head screws (Figure 55, item 1) that
connect the gearmotor to the drive spindle.
Figure 55
2. Remove the bolts that connect the motor to the drive
assembly (Figure 56).
3. Remove the motor (Figure 56, item 1) from the drive
assembly (Figure 56, item 2).
Figure 56
WARNING
SEVERE HAZARD!
LOCK OUT POWER before removing guards
or performing maintenance. Exposed moving
parts can cause serious injury.
WARNING
PUNCTURE HAZARD!
Handle drive shaft keyway with care. It may
be sharp and could puncture the skin,
causing serious injury.
1
1
2