Shear Pins in Reciprocating Sludge Pumps

MIL-HDBK-1164

c)

Check the packing-gland adjustment each week to make sure that

the gland is just tight enough to keep sludge from leaking through the gland, making

sure that the piston walls are not being scored. Before operating a pump, especially

after it has been standing idle, loosen all nuts on the packing gland.

6.5.4.2

Bearings and Gear Transmission for Reciprocating

Sludge Pumps

a)

Daily (or once per shift), lubricate the bearings and the gear

transmissions with a grease gun. If the pump runs continuously, grease more often

than once a shift.

b)

Check the gear transmission each month and keep it filled to the

proper level with the proper oil. Open the drain to eliminate accumulated moisture.

c)

Change the oil every 3 months to prevent excessive emulsification.

6.5.4.3

Shear Pins in Reciprocating Sludge Pumps

a)

Check the shear-pin adjustment each week. Set the eccentric by

placing a shear pin through the proper hole in eccentric flanges to give the required

stroke. Tighten the hexagonal nuts on the eccentric flanges just enough to take the

spring out of the lock washers.

b)

If shear pins fail, check for a solid object lodged under the piston, a

clogged discharge line, or a stuck or wedged valve.

c)

When a shear pin fails, the eccentric moves to the neutral position

and prevents damage to the pump. Remove the cause of failure and insert a new

shear pin.

6.5.4.4

Ball Valves in Reciprocating Sludge Pumps. Every 3 months, replace all

valve balls that are worn small enough to jam into the valve chamber. A decrease in

diameter of 1/2 inch (13 mm) is sufficient to cause this difficulty. Check the valve

chamber gaskets and replace them when necessary.

6.5.4.5

Eccentrics in Reciprocating Sludge Pumps. Each year, remove the brass

shims from the eccentric strap to take up the babbitt bearing. After removing the shims,

operate the pump for 1 hour and check the eccentric to be sure it is not running hot.

6.5.4.6

Progressive-Cavity Sludge Pumps. Follow these maintenance

procedures for screw-type sludge pumps:

102