7
Fig. 3
1.2.3. Installations of Driving Device
The drive between the mud pumps and prime mover should be adopted V-belts or multi-row chains
drive, which is installed with precision to assure longest service life and minimum possibility of
unexpected or undesirable shutdowns due to drive failures.
When installing the drive sheave or sprocket, make sure all grease or rust preventative is removed
clearly from the shaft end and the matched bore. Remove all burrs or rough spots from the shaft, key,
and keyway. Fit key to the keyways in both the shaft and drive and install key into shaft keyway.
Coat pinion shaft with light grease of anti-adhesive compound or light oil and install the drive sheave
or sprocket hub. Tighten hub bolts as indicated below:
Use of wrench or lengthening bar to tighten bolt may lead to increase of torque, so it is necessary and
important to tighten bolt according to the following torque values, because in mounting the hub, the
tightening force on the bolts is multiplied many times by the wedging action of the tapered surface.
This action compresses the hub for a snug fit on the shaft. If the bolt-tightening forces are extreme,
bursting pressure is created in the hub of the mounted pulley; this pressure may cause the hub to
crack. The hub bolts should always be tightened alternately, progressively and gradually.
Wrench Torque N.m
Wrench Length mm
Wrench pull N
810 900 900
Note
：
N=0.1kgf
1.2.3.1. V-Belt Drives
1. Check sheaves groove condition
Before installing the v-belts, check if sheave grooves is worn or rounded for wearing, worn grooves
will destroy V-belts rapidly. The sidewalls must be straight. In sheave grooves there is no dirt, rust or
other extrusions, which could damage the V-belts.
2. Check alignment of belt pulley
3. Adjust V-belt for previous tension
