3-4 Maintenance & Troubleshooting
MN409
S
For higher temperature, oil coolers should be used.
S
For lower temperatures, heaters should be used to assure adequate starting temperatures.
Viscosity in SUS (centistokes) at 100
°
F (37.8
°
C).
Pour point: Below minimum starting temperature.
Quality: Use a good grade of turbine type oil, with rust, foam, and oxidation inhibitors.
Avoid automotive oils or additives unless specifically recommended by the oil manufacturer.
Oil Change Procedure
1.
Disconnect and lockout the power source. Ensure no power is applied to the motor.
2.
Remove the drain plug, located at the bottom of the bearing housing.
For the non
−
drive end, the oil drain pipe is labeled on the fan cover.
3.
If the oil appears to be contaminated, the housing can be flushed out by filling with fresh oil
and draining again until oil is clean.
4.
Replace plug and fill at oil fill to the sight gauge mid point.
5.
Tighten fill cap and plugs, fill constant level oiler if provided.
6.
Start unit and observe to be assured of no oil leakage and level does not drop.
G50 Sleeve Bearing & Cartridge Removal Instructions
1.
Disconnect and lockout the power source. Ensure no power is applied to the motor.
2.
Remove the fan cover/air scoop and accessories (forced lubrication plumbing) that are
assembled to the end shield and bearing housing.
3.
Loosen bolts and remove protective cover bolted to flange of the end shield.
4.
The bearing housing must be disassembled from the end shield before removing the end shield
from the frame.
5.
Remove drain plug at bottom of bearing housing and drain oil from the reservoir.
6.
Loosen and remove the bolts at the split line of the bearing housing.
7.
If the motor has insulated bearings and meets API
−
541 , a machined seal will be assembled
outboard of the bearing housing. The seal must be dissembled from the bearing housing before
removing the top half of the bearing housing. The seal is insulated from the bearing housing
with a non
−
split gasket. The bearing housing top half can not be removed unless the seal and
gasket are disassembled from the bearing housing.
8.
Use the lifting eye bolts, lift the bearing housing top half straight up and pull forward away from
the bearing area to clear the end shield. Insure that the bearing and seals are cleared before
moving the bearing housing top half forward.
9.
Lift the upper half of the bearing liner and remove from bearing housing.
10. Loosen and remove the bolts at the split line of the oil ring.
11. Remove oil ring.
12. Disassemble the garter springs that encircle the labyrinth seals (inboard and outboard).
13. Lift and remove the upper half of each seal. Rotate the lower half out of the seal carrier.
Note: The labyrinth seals must be assembled so that the
locking tabs will be in the 9:00
position. The
drain back holes in the seal face must face towards the oil sump
and be located in the 6:00
position.
14. Disconnect and remove RTD’s from the lower half of the bearing liner.
15. Use hoist, jack or a non
−
metallic sling around the shaft to lift the shaft off the lower half of the
bearing liner. Roll the lower half of the bearing liner out of the bearing housing.
This Manual:http://www.manuallib.com/baldor/mn409-large-ac-motors-handbook.html