1. Drive Arrangement Main Gear Unit (Shaft Mounted) Main Motor
Hydraulic Coupling
Swing Base
Auxiliary Drive
Back Stop
Shrink Disc
Freewheeler

2. Drive Arrangement MC-Series Auxiliary Drive Adapter Flange
Inductive Sensor
Freewheeler
LSS (Solid or Hollow Shaft)
Backstop

3. (Cooling Fan Optional)
Drive Arrangement
Double Lip Seals with
Grease Nipple or
Au-Taconite Seals
M-Series
Adapter Flange
Auxiliary
Drive
LSS (Solid or Hollow)
Freewheeler
Backstop
HSS
(Cooling Fan Optional)
Foot Mount or
Torque Arm

4. Selection Criteria
Main Gearbox
Usually a 3-stage bevel-helical gearbox
Ratio between 28:1 to 63:1
Fs > 1.5 against Pk1
Selection of cooling fan depends on environment (not for dusty environment)
Selection of oil cooler depends on availability of water
Backstop optional but often required
Auxiliary drive optional but often required

5. Selection Criteria
HSS and LSS Connections
HSS connections:- Flexible coupling, gear coupling, hydraulic coupling, etc
Solid LSS connections:- Gear coupling, rigid coupling, pin coupling, etc
Hollow LSS connections:- Key way or shrink disc

6. Selection Criteria
Oil Seals
(i) Double Lip Seals with Grease Nipple
Regreasable dust protection cover
For dirty and dusty environments
Dirt will bind onto grease
Regreasing interval: months (To purge dirty grease)
Rotate shaft when regreasing

7. Selection Criteria
Oil Seals
(ii) Radial Grease Labyrinth Seal (Australian Taconite Seal)
Rotating cover with grease labyrinth
For environments with abrasive particles
Dirt trapped by grease labyrinth
Regreasing interval: months (To purge dirty grease)
Rotate shaft when regreasing

8. Auxiliary Drive
Used to rotate bucket elevator at slow speed (during maintenance or problem)
Also called Inching Drive, Maintenance Drive or Sunday Drive
SEW-Eurodrive KF unit or SF unit
Freewheel coupling or manual clutch isolates gearmotor when main motor is running
2 modes of operation: (a) Maintenance Drive (MD) (b) Operation Under Load (OUL)

9. SEW Gearmotor (KF or SF unit)
Auxiliary Drive
SEW Gearmotor (KF or SF unit)
Adapter Flange
Auxiliary drive connected to second shaft (for right angle units)
Inductive sensor used to detect failure of freewheel coupling (connected to control panel)
Failure of freewheeler is catastrophic!!!
- n1 = 1500 rpm, bevel ratio = 3: gear motor ratio = 40 : 1
è KF motor speed = 1500 / 3 x 40 = rpm !!!
Freewheeler
Inductive Sensor

10. Auxiliary Drive - Mode of Operation
(a) Maintenance Drive (MD)
Used only when buckets are empty (for maintenance purpose only)
SEW KF type used
Inching torque (at LSS) = 40 to 45% of normal running torque (Mk2)
Inching speed (at LSS) = 2 to 5 rpm
Gearmotor ratio = 20:1 to 90:1

11. Auxiliary Drive - Mode of Operation
(b) Operation Under Load (OUL)
Used when the buckets are loaded
SEW SF or KF type (with brakemotor)
Inching torque (at LSS) = 90 to 100% of normal running torque (Mk2)
Inching speed (at LSS) = 2 to 5 rpm
SF gearmotor ratio = 20:1 to 63:1 KF gearmotor ratio = 20:1 to 90:1
Worm gear more resistant to shock loads and peak loads

12. Application Examples Typical Arrangement Bevel-helical main gear unit
Main motor
HSS coupling
Coupling guard
Backstop
Freewheeler
Auxiliary drive
Solid LSS

13. Application Examples Typical Arrangement
Bevel-helical main gear unit (M3RHF50)
Main motor
Hydraulic coupling
Backstop
Freewheeler
Auxiliary drive (KF67 DT100L4)
Shrink disk
Swing base

14. Typical Arrangement - Dual Drive
Application Examples
Typical Arrangement - Dual Drive
Backstop Arrangement:-
1 backstop on 1 gear unit (Dimensioned for 100% holding load)
2 backstops on 2 gear units (Each backstop dimensioned for 100% holding load Total holdback capacity = 200%)

15. Application Examples Atypical Arrangement
Helical main gear unit (3C250N)
Main motor
Hydraulic coupling
Manual clutch (Rotex SD 55)
Auxiliary drive (R82 DM100S4)
Solid LSS
Base plate

16. Application Examples Atypical Arrangement
Helical main gear unit (M3PSF60)
Main motor
Hydraulic coupling
Manual clutch (Rotex SD 75)
Auxiliary drive (K87 DM132S4)
Solid LSS
Base plate