Spare Parts

Note : * -- Recommended sealkit
give complete details of model code as punched on the pump body.

Commissioning and Maintenance Instructions :

Polyhydron make Radial Piston Pumps are reliable hence require very little attention from user. However it is necessary that following points must be kept in mind while storage, assembly, commissioning and maintenance.

Storage :

For open execution type, it is necessary that during storage the pumps must be properly covered and well lubricated. This will prevent the ingress of dust/dirt in the working mechanism and during commissioning it will be easy to install the same.

Assembly :

During assembly take care to align the pump properly with respect to the electric motor or other driving mechanism. During assembly take care to align the pump properly with respect to the electric motor or other driving mechanism.

Badly machined flexible couplings will damage the bearings and the key in very short time. The flexible couplings used to drive the pump must be of good quality.

For open execution type it is necessary that the pumps must be properly immersed in the oil for its efficient and smooth working. The proportions of the tank should be adequate so that even after the maximum displacement of the oil from the tank the oil level should not fall below the minimum level for the pump. Please remember that the pump always needs its suction valves flooded with oil.

During assembly / installation provide a check valve with low or almost nil cracking pressure on the suction pipe and fill up the casing with oil before starting the pump. To be on safer side keep also the delivery port open.

For casing pumps the maximum negative suction head should not exceed 300 mm. The suction pipe should be 25 O.D. x 3 mm Th. and preferably straight.

During commissioning the delivery port should be left open till you get full / uninterrupted flow. (The pump need not have a check valve as mentioned below provided the oil level is not exceeding 300 mm below the pump suction port). This is not required to be done every time you start the pump after short durations ( a day or two ) of non-operation.

The direction of rotation of the pump is not important. However if the pump is coupled to any other make pump, then the direction of rotation of the pump depends on the coupled pump.

The radial piston pumps do not need any major attention, but to ensure its efficient working and long life of the pump it is necessary that the following points kept in mind:

Care should be taken that the oil should be periodically changed. The use of Contaminated oil may damage suction valves and bearings.

For optimum performance the viscosity of the oil at operating temperature should be in the range of 40 – 70 cSt.

In case if you disassemble the pump use 5 kg-m torque for tightening the cap screws.

Case 1 : When the pump suction port height exceeds 300 mm above oil level.

Case 2 : When the pump suction port height is less than 300 mm above oil level.

Case 1 : When the casing pump is immersed in oil.
	Remove the alternate suction port plug (G3/4" BSP). Let the oil to enter Aluminium casing. Now loosen the casing air bleeding plug, by rotating it 3 to 4 times. Wait for a while so that the complete air goes out through casing air bleeding plug. Now, tighten the casing air bleeding plug and also plug the alternate suction port. Now start the motor & you will get an uninterrupted flow.
Case 2 : When the oil level is below the suction port (i.e up to a distance of 300mm. Maximum).
	In this case, put a check valve of negligible cracking pressure at the bottom of the suction pipe. Now fill the pump casing with oil. This can be done by providing a pipe connection to alternate suction port and bringing the other end at the top of the Tank Top Plate. Now loosen the casing air bleeding plug & keep on filling the casing till you see the oil coming out of casing air bleeding plug. After this tighten the casing air bleeding plug. Also, plug the oil filling port & check it to be air tight. Now start the motor & you will get an uninterrupted flow.