8
Adjust the belt tension by moving the belt pulley center distance until all of the sag has just been
eliminated from the tight side of the belt and some of the belts on the slack side. Then increase the
given center distance. For example: on 2540mm(100
″
) Center distance, after adjust center distance
then increase additional 13mm(1/2
″
). On 3180mm (150
″
) center distance, after adjust center distance
then increase additional 19.5mm (3/4
″
).
Do not obtain belt tension by picking up end of pump and allowing belts to tighten under weight of
pump as end is being lowered to the ground.
1.2.3.1 Chain Drive
1) Installation
Proper installation and maintenance of the sprocket and chain drives are essential if good service life
is to be obtained. Since many factors, such as chain width, center distances, speeds, and loads must
be considered when determining the allowable tolerance for sprocket alignment; no good “rule of
thumb” can be applied. The chain alignment must simply be held as nearly perfect as possible. A more
precise alignment can be made by stretching two steel wires (piano wire) along one face of the two
sprockets, one above and the other below the centerline, and moving one of the sprockets until the
wires touch at four points. This will determine that the centerlines of the drives are parallel and the
faces of the sprockets are square.
2)
Drive chain lubrication
The pump drive chain lubrication system on the majority of F series of pumps is an independent
system having its own oil pump, reservoir and drive. Fill chain case to the indicated level with lube
grease. Lubricant brand can refer to “Lubrication oil guide of BOMCO products”.
If temperature is below 0ºF, consult department of lube grease supplier for recommendations.
Lube grease should be in accordance to relevant specification and lubrication manual based on
specification.
Chain lubricating system is an independent one, which requires the same maintenance or service
attention employed on any other piece of machinery, includes:
z
Daily check of grease level.
z
Daily check on condition of lube grease.
z
Check oil pressure. (5-15psi) (0.35-0.103Mpa).
z
Supply a volume of grease to chain.
z
Check nozzles in spray tube.
z
Check oil pump drive (V-belts or chain)
NOTE:
1. Oil pressure may be adjusted with the pressure relief adjusting screw on the rear of the pump
housing.
2. Pressure drops may also indicate suction and discharge filter screens need cleaning.
1.3. Requirements for Suction System
For design of suction system of mud pump, individual installation is needed. The suction of the
F-series pumps must have a positive head (pressure) for satisfactory performance. When the optimum
pressures of suction manifold is 0.14~0. 21Mpa (20~30 psi), mud pump has maximum volumetric
efficiency and expendable parts life, which is required with 6 x 8 centrifugal pump (with 45kw,
