13
MAINTENANCE
The bearing temperature will usually rise after regreasing
due to an excess of grease. Temperatures should return
to normal after the pump has purged the excess grease.
Never mix greases of different consistency or thickener. If
it is necessary to change, remove all of the old grease
from the housing.
SHAFT SEALS
Packed Pumps
DO NOT STOP LEAKAGE! Packed glands drawn up too
tight increases power consumption, increases wear on
shaft, and shortens life of packing. When leakage can no
longer be controlled by drawing up on the packing gland
add another ring of packing to the stuffing box. After
further operation and leakage again can no longer be
controlled replace the packing by using the following
procedure:
1. Remove all old packing from the stuffing box. Clean
box and shaft sleeve thoroughly and examine for wear.
Replace shaft sleeve if wear is excessive. Check bearing
by lifting shaft up and down; do not expect packing to act
as a bearing.
2. Use the right cross section of packing, Rotech uses
Non-Asbestos packing as our standard for general
purpose applications. Packing for special applications
available, consult factory.
3. When using coil or spiral packing always cut the
packing into separate rings. Never wind a coil of packing
into a stuffing box. Rings can either be cut with butt
(square) joint or diagonal joints. (Fig. 9) The best way to
cut packing is on a mandrel the same diameter as the
Fig. 9
BEARINGS
All pumps are lubricated at the Rotech plant and should
not require additional lubrication for approximately 1200
hours of operation. A well planned maintenance sched-
ule can only be devised after the first six months of opera-
tion and the lubrication record review at that time. Each
pump installation is unique and requires individual atten-
tion to set up the proper lubrication schedule for each
specific installation. About once every year it is recom-
mended that the bearings be cleaned and flushed with
carbon tetrachloride and then relubricated.
Oil Lubricated
A high quality turbine oil with rust and oxidation inhibi-
tors, such as Mobil DTE 26 (300 SSU) or its equivalent,
should be used. Fill bearing frame with oil until level is at
the center of the sight glass.
TABLER 3: OIL CAPACITY
TABLER 4: LUBRICATING OIL DETAILS
or any SAE 30 Non-Detergent oil.
Grease Lubricated
1. When regreasing ensure the grease container,
greasing device, and the grease fittings are clean to
prevent impurities from entering the bearing housing.
2. Remove the 2 grease relief plugs from the bottom of
the bearing frame.
3. Fill both grease cavities with Chevron SRI #2 or
equivalent until fresh grease comes out of relief holes.
4. Reinstall the grease relief plugs.
5. Check the frame seals to ensure they are seated in the
bearing housing. If not, press into place with drains
located at the bottom.
Manufacturer
Oil
Chevron Turbine Oil
GST 68
Atlantic Richfield
DURO 68
EXXON
TERESSTIC 68
Texaco INC
Regal R & O 68
Mobil
DTE Heavy - Medium
Amoco Oil
Amoco Industrial Oil # 68
Frame
Pints
MTR
1.25 Approx
STR
0.55 Approx
Butt Joint
Diagonal Joint
