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Appendix 2: Simple Pump Maintenance

1. Occasional Pumping

If your water has a high suspended solids content or high minerals content, deposits could accumulate on parts. Work the pump monthly for a few minutes to keep deposits from forming.

2. Seal Kit and Rod Gland Replacement

Signs that Seals Need Replacing

The length of time between seal replacement can vary greatly with amount of use and water quality. Most clients have done maintenance at somewhere between three and ten years:

For piston seals: when output drops appreciably.

For pump heads seals: when water leaks between the pump rod and the rod gland in the pump head.

Seal Kit Details

Model 100: The SK100BU seal kit for a model 100CA pump cylinder assembly and pump head is comprised of five (5), 90 durometer u-cup seals. Three (3) u-cup seals are provided for the piston in the pump cylinder: two urethane (with either yellow or red ID marks) and one buna (black with no ID marks), and two (2) buna u-cup seals are provided for the rod gland in the pump head.

Model 125: The SK125BU seal kit for a model 125CA pump cylinder assembly and pump head is comprised of four (4), 90 durometer u-cup seals. Two (2) urethane u-cup seals (with either yellow or red ID marks) are provided for the piston in the pump cylinder, and two (2) buna u-cup seals are provided for the rod gland in the pump head.
The piston seals ride on the inside wall of the stainless pump cylinder sealing between the piston OD and the cylinder ID while the rod gland seals ride on the 3/4" OD stainless steel rod that runs up and down in the pump head.

Model 125-82515: The SK125-82515 seal kit for a model 125CA-82515 pump cylinder assembly and pump head is comprised of four (4), 90 durometer u-cup seals. Two (2) urethane u-cup seals (with red ID marks) and (2) buna u-cup seals are provided for the piston in the pump cylinder, and two (2) buna u-cup seals are provided for the rod gland in the pump head.  The position of the seals on the piston body are urethane, buna, buna, urethane.
The piston seals ride on the inside wall of the stainless pump cylinder sealing between the piston OD and the cylinder ID while the rod gland seals ride on the 3/4" OD stainless steel rod that runs up and down in the pump head.

Note that rod gland gland replacement is also explained, but the need for it is rare.


CHANGING THE PUMP HEAD SEALS

Remove the Lever Arm Assembly

All seal replacements start with removing the lever arm mechanism:

Using the 3/16" Allen wrench, remove each of the four fasteners that hold the lever arm mechanism to the pump head (right).

Unscrewing lever arm bracket.

Unscrew the clevis from the pump rod.

Move the lever arm clockwise while keeping the pump rod from rotating using your vice grip or channel lock (left).

*** The direction you unscrew is the opposite of normal -- turn clockwise to remove, rather than the normal counterclockwise.

This will remove the lever link arm, bracket, and lever arm, from the 3/4" stainless rod.

How to insert the rod gland's u-cup seal - showing correct position with U facing down.

IF YOU HAVE A SHORT ROD GLAND

Unscrew the rod gland from the pump head.

The 2 u-cup seals in the pump head are located at the top end of the rod gland, in two machined grooves.

*** The buna rod gland u-cup seals must be installed with open end of “U” facing down.

IF YOU HAVE A LONG ROD GLAND

Remove the pump head by unscrewing it. Rotate it in a counterclockwise motion. A good number of rotations are required before it detaches from the riser tube. You may need to first loosen it with a channel lock.

The 2 u-cup seals in the pump head are located at the top end of the rod gland, in two machined grooves.

Once the pump head has been removed, the u-cup seals can be easily accessed for replacement.

Replacing seals on pump piston. Correct position with end of U facing up.CHANGING THE PISTON SEALS

In order to replace u-cup seals on the piston, the pump system must be pulled from the well as the piston is in the pump cylinder, at the bottom.

*** Piston U-cup seals MUST be installed with open end of “U” facing UPWARD (see right).




Install seals in the order shown in the diagrams following.

(Diagrams show each of our different pistons.)


Reinstall pump cylinder, drop pipes and pump head as described earlier in this document.

*** For systems that have been installed three or more times, use Loctite non-permanent thread bonder on the sucker rod connections.

*** For drop pipes: Use Teflon tape on connections, but never more than three layers. And never use a liquid sealant/pipe dope.

REINSTALL PUMP HEAD AND HANDLE

For long rod gland: Install pump head onto riser (COUNTER-CLOCKWISE to tighten).

For both:
Install clevis onto 3/4" stainless rod (COUNTER-CLOCKWISE to tighten).
Install the (4) 1/4-20 x 1/2 shcs that affix the lever bracket to the pump head.


Next page: Changing the Rod Gland




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SIMPLE PUMP COMPANY, LLC
1140 Amarillo Drive, Gardnerville, Nevada 89460-7504
Phone: 877.492.8711 (toll free) or 775.229.8175
Mon-Fri 8-5 Pacific Time