A. The Dry-Pac system can be fitted to all MKII and MKIII versions of our pump. The MKII and MKIII versions can be quickly identified by the position of the air inlet holes. All these pumps have two air inlet holes at the bottom of the inner slide tube. Depending upon the age of manufacture these holes may be exposed or covered by either a plastic or aluminium ring.
We have changed the method of connecting the Dry-Pac on some versions of our pump. To mitigate any confusion we have released a Universal Dry-Pac kit Product Code Z2128-690 that includes all the different connection types. This kit will fit all MKII and MKIII pumps.
If you have a problem with your Hill Air Compressor Pump which you feel is covered by our Warranty (terms & conditions below), please return the pump with a valid Hills returns number along with a covering letter to:
Ernest H Hill Limited 10-12 Meadowbrook Park Station Road Halfway Sheffied S20 3PJ
Limited Lifetime Warranty
If you the original purchaser of the pump find any defect in material or workmanship with your Hill Air Compressor Pump, please return if to Ernest H Hill Limited at the above address.
Please call us on 0114 2484882 and obtain an official returns number which you must write clearly on the pump. This warranty does not cover accessories, paint finishes or general wear and tear of the pump.
When you send your pump please make sure to send it by registered post. We do not accept responsibility for items that do not reach us.
Full Pump Service
We offer a comprehensive 'Full Service' for all Hill Air Compressor Pumps of whatever age, service or state.
Please contact us for details and note; we do not accept pumps back without a valid returns number.
A. The Dry-Pac system can extract up to 99% of moisture. Extensive testing has been undertaken in a variety of atmospheric conditions and a consequence we would expect that during the life of the medium over 90% of the moisture will be consistently removed. No other hand pump filter system can currently achieve this level. The Dry-Pac medium will lose its effectiveness when fully saturated and therefore for peak performance it is recommend that the medium is frequently replaced. The Hill Dry-Pac medium is designed to work with flowing air and is the only material recommended. Other materials such as silica gels have entirely different properties and are unsuitable and ineffective.
A. Moisture has long been a concern associated with compressed air. To combat these concerns the Hill Dry-Pac System is a patented method of reducing the amount of moisture in the ambient air prior to pressurising and filling PCP air weapons with the Hill Pump or any other suitably converted hand pump. The Dry-Pac system will extract over 90% of moisture from ambient air. No other hand pump filter system can currently achieve this figure.
A. The Hill Pump is fully servicable. All parts of the pump are accessible and exchangeable. A pump that is well maintained will reward users with reliability. With average usage we recommend that on pumps without the Dry-Pac fitted the micron filter is checked every 2 – 3 months. The filter on pumps fitted with a Dry-Pac should be checked every 6 - 7 months. All pumps should be sparingly lubricated a couple of times per year using NGLI2 silicone grease. These frequencies will obviously vary according to usage patterns. Due to the working pressures and the temperatures generated by the pump it is advisable to periodically have the internal seals inspected and replaced where necessary, also taking the opportunity to ensure that the pump is adequately lubricated. Under average usage this should be carried out every eighteen to twenty four months. The micron filter is easily changeable by users and a seal replacement kit is available for users who are confident in stripping down the pump themselves. Authorised repairers will have stocks of genuine spare parts for the pump. The original seals were especially chosen for their qualities and although unauthorised replacements may appear to fit dimensionally they may be inadequate for purpose.
A. The Dry-Pac system is attached to the pump over the inlet holes on the MKII Hill Pump. The Dry-Pac should always be fixed in the vertical position but it can be rotated around the pump wherever convenient. The pump is pumped in the usual way and the incoming air is drawn over a specially selected medium that extracts the water molecules. The dryer air is then passed through the pump in the normal manner. No extra effort is required for pumping. The extraction is a one way process and eventually the medium will become saturated and require changing to maintain effective extraction. Vacuum sealed packs of the medium are readily available and reasonably priced. A quick release connection on the cartridge allows users to exchange the medium within minutes. Obviously users in high relative humidity conditions will have to exchange the extract medium more frequently than those in less relative humidity areas.
A. All air compressor pumps require regular lubrication to maintain peak performance. All Hill Pumps are factory lubricated with our own brand of NLGI 2 Silicon Grease. We do not recommend any other brand of grease. Lubricant should be applied very sparingly to the inner tube and pumped for a few strokes. Over lubricating can be as damaging as no lubrication. A lack of lubrication will cause early wear on the internal seals thus reducing their useful life. It will also make the pump difficult to operate. Excess lubrication can impede the airflow through the pump causing restrictions that make the pump more difficult to operate. It is good practice to have the pump fully cleaned and re-lubricated every 2 - 3 years. We also remind users never to use any petroleum, oil or propellant based lubricant on the Hill Pump. Not only will this invalidate any warranty it will almost certainly result in damage to the pump.
A. Taking full strokes on both the up stroke and the down stroke is good practice. We have found the most effective pumping method is to mimic a "pantomine policeman" with straight arms and back allowing body weight to assist with the down stroke (comical but effective). The Hill Pump works in both directions and has been specifically designed for easier operation on the up stroke. Full strokes also help to distribute the lubricant throughout the pump ensuring that the seals are not subjected to unnecessary stresses or drying. The action of compressing air to 3000 psi generates heat within the pump. Prolonged or continuous use (such as may be experienced in some gun clubs) can lead to excessive temperatures that can damage and shorten the life of the internal seals. We recommend pausing after approximately forty strokes or if the pump body feels excessively warm at anytime. Unless you have the Dry-Pac system fitted we also recommend that the bleed valve is opened at this point. This will not only allow the pump to cool, but expel any excess moisture from the pump.
A. The moisture extraction process of the Dry-Pac is not reversible at any point. The Dry-Pac medium will eventually become fully saturated and require replacement. The only replacement medium we recommend is the Hill medium (product code 062128-56). This has been carefully researched and selected to give optimum performance. Do not attempt to use or mix other absorbent materials such as silica gels or dyed markers. These products have entirely different properties and will impair the correct functioning of the Dry-Pac. Replacing the medium is very simple. The Dry-Pac cartridge has a bayonet fitting that can be quickly uncoupled whilst attached to the pump. Carefully remove the internal filter and retain. Pour out the old Dry-Pac medium and dispose of safely (the Dry-Pac is 100% non toxic and can be disposed of in any normal manner). The Dry-Pac medium is sold in vacuum packed sachets with the optimum amount of medium to refill the Dry-Pac cartridge, tear open the sachet and empty the entire contents into the cartridge, replace the filter and twist click the cartridge back into the bayonet fitting.
A. This is likely to be worn or damaged internal seals. These seals can be easily replaced by a suitably authorised repairer or for users who are confident about stripping down the pump themselves a full seal replacement kit is available. For optimum performance we recommend that all the seals are exchanged every 2-3 years.
A. The standard version Hill Pump is supplied with a 1/8” bsp female connection. Hoses or adaptors can be fitted directly to that connection. Research has shown that this is the most commonly used size by air gun manufacturers. Other adaptors and quick release couplings are available directly from Hill.
A. Double check all the external connections and that the gauge is not showing any signs of losing pressure. If the pump appears and feels to be working correctly there may have been damage to the actual pressure gauge especially if the pointer is locked in one position. Replacement pressure gauges are readily available and can easily be changed by users.
A. We require your name, address and postcode to ensure we send your order to the right place. We ask for a contact telephone number in case we need to contact you regarding your order. We do not share this information with anyone else. Please view further information on security and privacy.
A. There is a precise scientific correlation between the volume of air at a given pressure and the force required to generate that pressure. It becomes a subjective judgement about how much volume a pump should generate per stroke versus the effort required. The Hill Pump has the largest volume per stroke of all the pumps on the market, therefore minimising the strokes required for a full charge. The Hill Pump works on both the down stroke and the up stroke. The pump was designed to be especially easier on the up stroke where there is minimal assistance from body weight. Our extensive testing with many different users concluded that the Hill Pump is operable with a perfectly acceptable degree of average effort. Being highly subjective and individual to different users’ circumstances we always welcome feedback to assist with our future developments. Comments on this topic can be e-mailed via this site. Regrettably, due to the volume of traffic we may not be able to respond to every contributor but your views will be noted and considered in future developments.
A. It depends upon the size of the air reservoir, residual pressure remaining in your gun and the recommended working pressure for that particular model. You should always refer to the manufacturers instructions for the safe working pressure of you PCP. Hand pumps are best used as a top up device to keep your gun within optimum pressures. The initial strokes will charge the pump and you will see the pressure gauge indicator increasing. The pump will only begin to charge the PCP when the pressure in the pump exceeds the residual pressure in the gun. The lower the residual pressure has been allowed to drop the more strokes will be required to recharge the gun. If the residual pressure is very low or if you are recharging a high volume cylinder it is good practice to pause after say forty strokes to allow the pump to cool. The pump will hold the charge until you are ready to recommence pumping. An approximate guide for re-filling to full pressure is that one full stroke will equal one shot. The following formula can also be used as a further guide (note: the pressure is expressed in bars and capacity in litres).
End Pressure Required - Starting Pressure) x Cylinder or Bottle Capacity / 0.225 = Approx Strokes
E.g. (200 bar - 160 bar) x 0.3 [300cc] / 0.225 = 53.333 or 54 full strokes