SEVICING A HILLS PUMP

[SNAKEBITE]

HILLS PUMP SERVICING

 

GENERAL INFORMATION

 

The Hills pump is the most commonly used design and therefore the most widely available. The pump is best maintained once every six months or so depending on use. On pumps that are used regularly it might be an idea to service it whenever the “Dri-pacs†are changed. This makes service intervals easier to remember. Regular servicing will also extend the time between “O†ring replacement.

 

The most popular reason for servicing however is when the pump no longer functions. The main reason for this happening is that the small “O†ring in the central rod has worn. This allows air to leak past the seal and make it impossible to pump. This is most commonly felt when it becomes impossible to move the pump handle in the upwards direction. What is happening is a vacuum is forming and the air in the pump is going nowhere.

 

By far and away the best possible course of action is to purchase the correct service kit from HILLS. However as is often the case the pump can let you down when you do not have or are unable to get hold of the correct parts. As an interim measure it is possible to use a standard “O†ring. These are not made of the same material as the original ring but will get you a few weeks service until a proper replacement can be found.

THE “O†RING SIZE IS IMPERIAL BS007.

 

WARNING

 

When servicing the pump under no circumstances must any petroleum based greases or products be used. Due to the high pressures and temperatures involved any of those products could ignite and explode. SILICON grease must be used. It is also to important to apply the minimum of grease to avoid transference into the reservoir of the gun.

 

 

TOOLS NEEDED

 

3MM ALLEN KEY

MOLE GRIPS

SMALL DRILL APPROX 2.5MM

1 ¼ AF SPANNER

9/16 WHITWORTH SPANNER

CLEAN RAGS

NON PETROLEUM BASED DEGREASER

 

AN ADJUSTABLE SPANNER COULD BE USED IN PLACE OF THE OTHER SPANNERS IF THEY ARE NOT AVAILABLE.

 

 

DISASEMBLY AND REASEMBLY

 

1. Undo the bolts going through the handle (3mm Allen key)

2. Undo the brass ring at the top of the outer tube (Mole grips)

3. Withdraw the brass ring which is attached to the rod.

When it has been pulled out clear of the tube use the small drill to remove the dowel pin from the small hole just under the thread. Take the brass ring off the rod.

4. Using the 1 ¼†spanner and the mole grips (use a piece of rag in the jaws of

the mole grips to protect the finish) undo the outer tube from the brass nut.

5. Using the mole grips with the rag in the jaws (VERY important as any marks

On this tube will affect the sealing of the pump and affect performance) and

the 9/16†spanner undo the brass nut at the top of the inner tube. This removes

the middle and inner sections from the base.

6. Withdraw inner rod from tube. The “O†ring at the bottom of the tube is the one that will need replacing.

7. De-grease and clean all surfaces.

8. Replace “O†ring. Lightly grease the shaft at the base and the “O†ring itself.

9. Screw tube back into base.

10. Screw outer tube onto bottom brass nut. Lightly grease thread, shaft and “O†rings.

11. Replace top brass nut and pin. Screw into tube.

12. Replace handle.

 

That’s about the sum of it. You can go as far as to clean out the hose and the base assembly if it is covered in cack, however regular servicing and minimum greasing will stop this happening.

[Theskyfox]

Cheers for that bit of info, Ive got a Hills Pump with moisture filter...If it ever jams then I know to take it to the gunshop. Thanks again!

[Evilv]

Cheers for that bit of info, Ive got a Hills Pump with moisture filter...If it ever jams then I know to take it to the gunshop. Thanks again!

 

I was just thinking I should take a deek inside my Hillspump since it's done a bit of work this year. It would be a real pain if it stopped working when I need it.