Simple Pump 100 Guide

MAINTENANCE OF THE
HAND-OPERATED SIMPLE PUMP
LAST UPDATED: June 25, 2018
If you are a homeowner, you must have a helper for uninstalling or installing any pump.
READ EACH SECTION CAREFULLY BEFORE PROCEEDING.
FOLLOW INSTRUCTIONS STEP BY STEP.
Pay particular attention to anything marked ***.
(The following instructions should tell you everything you need
to know. If you have questions, please phone [phone].)
SIMPLE PUMP COMPANY
2516 Business Parkway,!Unit B / Minden, NV 89423 / USA
Phone: [phone] (toll free) or 775-267-1093
Mon-Fri: 8am-5pm PST (GMT/UTC -8hours)
Fax: [phone] (toll-free)
www.simplepump.com
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TABLE OF CONTENTS
Seal Kit Replacement 2
Seal Kit Descriptions 2
Changing the Pump Head Seals 3
Changing the Piston Seals 4
Replacing the Rod Gland 5
SEAL KIT REPLACEMENT
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. Signs they need
replacing are:
‣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 DESCRIPTIONS
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 red ID marks) and one buna (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 red ID marks)
are provided for the piston in the pump cylinder. 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 ¾” OD stainless steel rod 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.
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CHANGING THE PUMP HEAD SEALS
1. Using the 3/16" Allen wrench, remove the (4)
1/4-20 x 1/2 shcs (socket head cap screws) that
affix the lever bracket to the pump head.
*** 2. Hold the 3/4" stainless rod while using
the lever arm to rotate the clevis CLOCKWISE
to remove clevis from the 3/4" stainless rod.
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.
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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 at the bottom.
*** Piston U-cup seals MUST be installed with open end of “U” facing UPWARD (see below).
Install seals in the order shown in the diagrams following.
(Diagrams show each of our different pistons.)
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REINSTALL PUMP SYSTEM
As described in the installation instructions. They contain many detailed points you must pay attention
to when installing.
If you don’t have those instructions, you can
Read online: simplepump.com/support/documents/simplepump-hand-pump-install1/
Or download a PDF: simplepump.com/wp-content/uploads/2018/02/SIMPLEPUMP-HandPump-
Install.pdf
SPECIAL NOTES:
*** For systems that have been installed more than three times… The use of Loctite non-
permanent thread bonder is recommended 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.
REPLACING THE ROD GLAND
IF YOU HAVE THE SHORT ROD GLAND
Remove the handle assembly as described under “Changing the Pump Head Seals”, two pages back.
Remove the rod gland from the stainless pump head using the channel locks (counter-clockwise to
loosen). Leave the o-ring in place beneath rod gland in pump head.
Thread in the new rod gland.
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.
IF YOU HAVE THE LONG ROD GLAND
It will be replaced by the short rod gland and guide.
REMOVE LONG ROD GLAND
Remove the handle assembly and pump head as described under
“Changing the Pump Head Seals”, two pages back.
The long rod gland runs the length of the assembly at length (middle
arrow).
Remove the spider (lowest arrow) by unscrewing COUNTER-CLOCKWISE to
loosen.
Remove the rod gland from the stainless pump head using the channel
locks. Again, COUNTER-CLOCKWISE to loosen. Leave the o-ring in place
beneath rod gland in pump head.
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INSTALL PRESS-FIT GUIDE
Install the guide as shown in the four photos below.
Place guide in opening of riser tube.
A mark is made on some PVC tubing at the 6.5” mark.
The guide can then be pushed the correct distance into the riser tube.
INSTALL SHORT ROD GLAND
Thread the short rod gland into the top of the pump head.
REINSTALL PUMP HEAD AND HANDLE
Install pump head onto riser (COUNTER-CLOCKWISE to tighten).
Install clevis onto 3/4" stainless rod (COUNTER-CLOCKWISE to tighten).
Install the (4) 1/4-20 x 1/2 shcs that fasten the lever bracket to the pump head.
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