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Installation
B344-21-880 Issue N
3.9.3 Filling procedure
Use the best fluid for your application. If the Diffstak pump already contains traces of pump fluid, you must refill it
with the same type of fluid. (Note that when you receive a 250/2000 pump, all internal surfaces will be covered with
a layer of Santovac 5 fluid.) If it is necessary to use a different fluid, you must clean the pump thoroughly before you
fill it with a different fluid.
Fill the pump with fluid as described below.
1. Check that the drain-plug is tightened securely.
2. Pour the required amount of fluid (see Section 2) into a clean container.
3. Unscrew and remove the knurled nut on the filler connection, then remove the dipstick and the ‘O’ ring seal.
4. Use a funnel to fill the pump with fluid. Do not pour all of the fluid in at once as you may overfill the pump; even
if the pump has been drained (see Section 5.4), up to 15% of the original fluid may remain in the pump. If you
overfill the pump, you must drain off the excess fluid (see Section 5.4).
5. If the pump has been used previously, inspect the ‘O’ rings. Replace the ‘O’ rings if they are damaged, or if
thermal set has taken place.
6. Refit the dipstick and ‘O’ ring then refit and tighten the knurled nut on the filler connection.
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