Hydra-Cell Pro Pump Repair Kits Explained

Hydra-Cell^® Pro pumps last because they have no dynamic seal. Packing is what leaks and shuts a line down. Scheduled work is oil in the hydraulic end (see the IOM for the model) and the parts that see process liquid.

There are not many of those parts, and you do not need a special bench or a factory school. If you can reach the cap screws around the head, you can change them in place.

Diaphragm Kit (D)

A standard diaphragm kit includes:

• Diaphragms
• Follower O-rings (screw retainers on some models)
• Manifold O-rings (outer, inner, and center-bolt on some models)
• Loctite 242

Valve Kit (V)

A valve kit rebuilds the check-valve stacks:

• Manifold O-rings (outer, inner, center-bolt)
• Check-valve O-rings
• Valve seats
• Valve discs
• Valve springs
• Tetra seals
• Dampening washers (when the model uses them)

Complete Kit (K)

A complete kit is the diaphragm kit plus the valve kit. How many diaphragms and valve stacks you get depends on how many chambers that model has.

Which Kit?

The wear parts are usually the disc and seat. They meet up to 29 times a second. As the face wears, seal efficiency falls and you see it as a swinging gauge or short flow.

Wear is contact first, then chemistry and abrasive velocity across that face. That is why discs and seats come in stainless, Hastelloy, tungsten carbide and ceramic. The rest of the stack has the same material choices. On clean, non-aggressive liquid, valves often last 8,000 hours or more.

Leave chemistry out of it and diaphragms and O-rings are not wear parts. The complete kit is still what most sites buy. The head is already open; the extra parts and minutes are small.

Weights and Dimensions

Pump Series	Complete Kit Dimensions (in)	Kit Weight (lbs)
20	9 x 9 x 2	0.5
3	9 x 9 x 2	0.5
10 / 12	9 x 9 x 2	0.5
15 / 17	11 x 8 x 2	1.0
25	11 x 8 x 2	1.0
35	12 x 12 x 2	1.5
40	12 x 12 x 2	1.5
66	12 x 12 x 2	2.0

Individual Components

You can buy pieces from the PDF or the online parts list. A D10 list looks like this, with every material option shown:

The kit is always less than the same pile of parts bought one at a time.

Tool Kits

You can do a fluid-end job with ordinary tools. If you have several pumps, two specialty tools earn their keep: the puller/lever and the valve plunger holder.

Puller / lever — lifts outlet seats straight out. Without it you tap them from the chamber side with a screwdriver and a hammer. The tool keeps the seat from cocking in the plate.

Valve plunger holder — holds the short plunger shaft so you can take out the diaphragm screw. Without it you pin the cross-hole with a small Allen wrench, which often bends.

Related Articles

• Online repair kit numbering and pricing tool
• Check valve wear insights
• Dampening washers — when they are required
• How to repair Hydra-Cell Pro pumps
• Hydra-Cell Pro pump tool kits
• Hydra-Oil change intervals