Slew Drive Installation
QCB Slewing drives are inherently easy to install and require little maintenance, but suitable preparation of the mounting structure is important.
- Overview
Installation and maintenance
Before installation:-- Check the slew drive for any damage. If you have any concerns contact NBC Technical.
- Clean the slew drive using any cold solvent (e.g. diesel oil) and the mounting structure
- Ensure eye bolts, straps or chains and adequate lifting apparatus are available.
- Remove the shipping bolts
Mounting surface flatness
The permissible horizontal deviation of the mounting surface is tabulated below
Slew drive size | 3 | 5 | 7 | 9 | 12 | 14 | 17 | 19 | 21 | 25 | |
Permissible flatness deviation | mm | 0.04 | 0.1 | 0.1 | 0.12 | 0.15 | 0.26 | 0.15 | 0.17 | 0.2 | 0.2 |
Lubrication
QCB Slew drives are supplied pre greased with SINOPEC 7014-1 synthetic grease suitable for an operating temperature range of -40°C to +200°C. The onus rests with the client to ensure the bearings are lubricated during installation.
QCB Slew drives will require lubricant to be applied to the slew ring raceway, the taper roller bearings at each end of the worm shaft, and to the worm gear itself.
Item | 7014-1 | Test Methods |
Appearance | Beige Smooth Buttery | Eye View |
Dropping Point °C | ≥280 | GB/T3498 |
1/4 Penetration (60 strokes),0.1mm | 70 | GB/T269 |
Corrosion Test(T3Cu,100 °C,3h) | Pass | SH/T0331 |
Apparent Viscosity(-40 °C,10s-1), Pas | 683 | SH/T0048 |
Under normal operating conditions (<2rpm; low to medium loads, -30°C to +60°C) it is recommended that the bearings and slew ring raceway are greased as follows:-
Dry, clean industrial workshop | Every 500 hours of operation or 12 months |
Wet, dirty environment | Every 250 hours of operation or 6 months |
Aggressive conditions or continuous operation | Every 150 hours or 4 months |
Extreme conditions | Every 50 hours or 2 months |
Consider using the GreaseMax automatic lubricators for continuous “fit and forget” maintenance.
Slew drive size | Quantity of grease to be applied (gr) | |||||||||
3 | 5 | 7 | 9 | 12 | 14 | 17 | 19 | 21 | 25 | |
Raceway | 10-15 | 15-20 | 30-35 | 45-50 | 55-60 | 70-75 | 95-100 | 120-130 | 140-150 | |
Gear | 33-35 | 50-60 | 55-65 | 90-100 | 100-110 | 100-110 | 110-120 | 110-120 | 130-140 | 130-140 |
Support brgs | 7 | 7 | 7 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Compatible greases include:-
ISOFLEX NBU 15; Dow-Corning 44; Mobiltemp SHC 100; Mobiltemp SHC 32; Caltex Unitemp 550
NOTE: QCB stock 380 gr cartridges (MOBIL SHC100 CART) as well as the full range of GreaseMax units prefilled with MOBIL SHC100 (grease code F239)
Bolts
When fitting the slew drive, remove the shipping bolts, and mounting bolts to ISO Grade 10.9 should be used.
If required, ask NBC Technical to check the bolt strength calculation.
Flat washers of the appropriate size and strength may be used to reduce under bolt head pressure. Split or conical washers may not be used.
Metric bolt tightening torques (Nm) | ||
Bolt diameter | Grade 10.9 | Grade 12.9 (Cap screws) |
M8 | 33 ± 3 | 45 ± 6 |
M10 | 72 ± 6 | 90 ± 10 |
M12 | 120 ± 10 | 150 ± 20 |
M16 | 305 ± 25 | 380 ± 50 |
M18 | 415 ± 35 | 521 ± 70 |
M20 | 600 ± 50 | 750 ± 100 |
Tighten the bolts in a crosswise pattern, first to 30%, then to 50% and finally to 100% of the recommended torque figure. After 100 hours of operation the bolt torques must be checked; thereafter annual inspection should suffice. Mark the position of the tightened bolt head so that later inspection can reveal if it has moved in service.
Seals
QCB Slew drives feature standard NBR rubber seals. These should be checked during maintenance and replaced if they have deteriorated.
Swapping from right hand to left hand drive
QCB slewing drives are usually imported and stocked with the motor mounted on the right hand side If requested we can change the units to left hand motor mount before despatch, but this is easily accomplished in the field.
- Remove the 4 bolts holding the end caps onto the main housing.
- Remove the end caps., the seals and the taper roller bearings cones.
- Gently remove the worm shaft - turning it will assist in this process
- Reverse and insert the worm shaft into the housing in the opposite orientation
- Replace the taper roller bearing cones and seals. Replace the end caps.
- Check rotation by hand.
Rotation of the slew drive
QCB Slew drives can be rotated by manual, hydraulic or electrical means.
MANUAL: The non-drive end of worm shaft has a hexagon head to enable the shaft to be turned manually. Some clients make hand cranks with suitable ends to engage in the drive end.
We can supply from stock a stub shaft and cover to lock the bearings in place if required. (25mm shafts only)
HYDRAULIC: Tabulated herewith ADAN motor data for maximum torque at 3 rpm. Other options may be satisfactory depending on the load and speeds required.
QCB reference | ADAN motor | Pressure (Bar) | Flowrate (liters per min) |
WGSE 7 | AMM 50 P | 70 | 12 |
WGSE 9 | MSA 125 2M | 150 | 26 |
WGSE 12 | MSA 125 2 M | 140 | 32 |
WGSE 14 | MSA 125 2 M | 140 | 34 |
WGSE 17 | MSA 125 2 M | 140 | 40 |
WGSE 21 | MSA 150 2 M | 130 | 64 |
WGSE 25 | MSA 150 2 M | 140 | 75 |
WGWEA 7 | MSA 100 2 M | 140 | 23 |
WGWEA 9 | MSA 150 2 M | 140 | 22 |
WGWEA 12 | MSA 150 2 M | 140 | 33 |
WGWEA 14 | MSA 150 2 M | 150 | 36 |
WGWEA 17 | MSA 150 2 M | 150 | 45 |
WGWEA 21 MTAP | MTAP 300 M | 165 | 75 |
WGWEA 25 MTAP | MTAP 300 M | 180 | 95 |
ELECTRIC: If requested we can supply ROSSIGeared motor units that can be mounted alongside the slew drives.