Series 1250 Pneumatic Chemical Injection Pump
Operating Manual
Page 15 of 19
The grease should be a premium quality multi-purpose, lithium-base NLGI No 2 grease
recommended for general industrial applications which meets or exceeds the requirements of DIN
51825: (2004-06) 2K-30. Avoid products containing Xylene.
5.2.1 Remove pump from service by first shutting off air supply to the pump.
5.2.2 Close the block valves on the chemical supply and discharge.
5.2.3 Disconnect the chemical supply from the pump at the suction check valve, and disconnect the discharge line
from the discharge check.
5.2.4 Remove the chemical head by removing the two head bolts and then separating the head component from
the body of the pump.
5.2.5 Unscrew and remove the packing nut, using 1/4” tubing or a packing nut tool. A packing nut tool is available
at no charge from CheckPoint.
5.2.6 For 1/8” plunger models, remove the internal snap ring from its groove. It is located on top of the sleeve just
below where the internal packing nut threads end.
5.2.7 Remove the suction check valve from the head.
5.2.8 Using the suction check valve hole for access, use a punch or screwdriver to push out the packing and sleeve.
5.2.9 On the 1/8” and 3/16” plunger sizes, remove the packing from the sleeve, along with the O-ring and backup
ring on the small outside diameter of the sleeve. Removal of O-ring and backup ring for the 1/8” model only applies
to serial numbers AB056731 (B Model) and AG057154 (GR Model) and earlier. Clean the sleeve and lightly grease it,
then install the new O-ring and backup ring supplied with your new packing. If you cannot locate these parts, please
contact CheckPoint for replacements. Your 1/8” pump may leak chemical without replacing these components
whenever you replace the packing.
5.2.10 Grease and replace the metal sleeve. Refer to the drawings at the end of this Guide for proper orientation
of sleeve. No sleeve is present on 1/2” plunger diameter models.
5.2.11 Examine the new set of packing closely and ensure, prior to installation, that it is oriented properly according
to Figure 8. Your packing will be similar to the cross-sectional view shown.
CP/MAN-PRD-015 REV. 15 EFF. DATE: 07/08/2022
