Hill MK4 hand pump issue

[Moody1]

I've had my Hill MK4 hand pump for about 1 1/2 years. It's been good for me until about a week ago. I started to notice that when I'm pumping up my gun, sometimes it felt as though the air wasn't going into the gun. And now it's happening with about 50% of the pump strokes. I don't hear any air leaking. It simply seems like the air is not always getting into the gun.

My questions are: Does this require the rebuild kit? Or does something need to be reseated or lubed? Also, if it needs the rebuild kit, the kit seems to be $10 cheaper from Airguns of Arizona than anywhere else. Would there be any difference in the kit?

Are the Youtube videos the best source for detailed instructions for the rebuild?

Thank you

 

[Butch]

https://m.youtube.com/watch?v=lbncFIaKGKs
this should help you. 

 

[ImpactX]

I had that same problem on my mk3 and mk4 hills. It would not fill with air or would be really hard when going up. Switch to compressor and never look back. I dont even know why ppl are still using hand pump. Back then compressor cost $3000 TO $5000 so i get it. But now a days compressor cost like $250 to $300. Not much more than a hill hand pump.

 

[Moody1]

Butch, thank you for the link to the video.

ImpactX, I have been "shopping" for a compressor. Just trying to sift through all the compressor information available here. Trying to find the sweet spot between price & reliability, if there is such a thing. I was hoping my hand pump would last until I picked a compressor.

 

[Pea-shooter O.G.]

I've had the issue of the Hill MK4 fighting me on the up stroke 2 times. First time was shortly after I bought it. I contacted Hill and they sent me some seals and instructions to address that specific issue. After 2 years of pumping my Marauder, it did it again, so I completely took it apart, cleaned, lubed and installed all new seals. Works well again, but, I bought a Yong Heng recently and have been super happy! A couple guys I shoot with also have the Yonger. A big down side to a compressor is that you go through pellets 4 times faster! That's no joke. 

 

[Pea-shooter O.G.]

Here is a picture of the instruction sheet supplied by Hill. 

And the parts kit they sent

Parts kit number Z4128-201

 

[Moody1]

Pea-shooter - Awesome. That is very useful information. Thank you for uploading the instructions and kit info. Though I have already ordered the complete seal kit Z4128-401.

I am in the process of compressor shopping. I think I'll still want the hand pump as a secondary air source.

 

[Nomadic Pirate 66]

In today's world it makes no sense to me to even consider buying a HILL pump, and this comes from someone that had 8 of them from MK II to MK IV

today a 50 bucks China pump from Amazon is superior to the HILL in every way,

a repair Kit for the HILL alone cost as much as a China pump.