I thought I would start a thread regarding the Benjamin paw pump and chronicle my experiences with it and effort and provide any technical insight into the care and feeding of this common PCP pump. Also, I wanted to certificate any upgrades or changes I made to the pump over time, how long it has lasted between maintenance needed and its overall operation.
Start, the pump I accept was bought used so I had no thought of its history every bit in how it was treated or if any maintenance was done, but upon its arrival information technology was clear the pump had seen use. Non in a bad way, but used.
I used the pump to do my initial sight in with the .25 Marauder and it felt similar the pump was working a little harder than it needed to pump the gun up to 3000psi. I decided since I didn�t know the pumps history a couple rebuild kits from Sunday Optics ($xiii.00 bucks shipped to my door) were in order. I didn�t want to keep using the pump until I had gone through it to verify its internal status.
While waiting for the rebuild kits to arrive I read all the threads on the GTA and Marauder forum on the who�s, what�south and why�s of the Benjamin pump including upgrades (i.due east. boosting) and general intendance and feeding. I too watched every YouTube video I could find on how to pull the pump down. This is keen information and I didn�t mail pictures of the tear downwardly because they exist in and so many places I idea information technology redundant. As well, that isn�t quite what this thread is about.
A week later the rebuild kit arrived so I broke out the hand tools and began disassembly. I thing, Sun Eyes proves a few actress O-rings, but not doubles of EVERYTHING. I have to say, the pump is very, very simple and comes apart with a minimal of hand tools. A few adjustable wrenches and I had it apart rather apace. The but issue was unscrewing the valve from the final piston bottom was really hard equally it was this pumps first fourth dimension being disassembled. The videos are correct, that was hard. But when y'all re-tighten the bottom valve to the internal piston you don�t torque the heck out it and so you won�t accept to confront that again.
Ane thing was immediately clear; that petty contumely filter doesn�t filter &^^&! Well maybe it keeps out insects, rocks and modest children walking buy while pumping merely the pump was full of moisture and whatever grease used to lube the pump was black and nasty. As I tried to remove the black goo and wet I started to get through rages chop-chop and the lube didn�t want to come up all the way off. So I grabbed my rubber gloves and took the parts to my garage and used a can of spray restriction cleaner. That removed the nastiness perfectly! I went over each role afterward cleaning and inspected them closely. The machining in some spots is a piddling crude. I had removed the original O-rings BEFORE the brake cleaner was used and inspected them while I let the brake cleaner flash off the parts. Upon wiping off the blackness goo I was surprised to encounter the O-rings were still in very practiced shape! Even the mutual #007 O-band that fails was PERFECT! I was tempted to re-use the O-rings just decided to start from new for my experiment.
One time all parts were cleaned and laid out with the proper O-rings. I began lightly applying the diver�due south silicone grease lightly to the O-rings and installing them. When I mean lite I hateful LITE! That stuff is thick and gooey. You lot barely need any on your fingers to burnish the O-rings. I also applied on the main piston rod an even coating of 15 wt. 100 % percent silicone shock oil from the local hobby store. I also added a light coat of the silicone oil to some of the O-rings to assist in assembly. Earlier I knew it the pump was back together!
Now, the one modern I did do was add a desiccant filter. Lots of means to do this, again pictures are all over the GTA and Marauder forum. I think this modern is needed in some grade or fashion. You can go the filters from Harbor Freight, NAPA Motorcar, etc. I then went to ACE Hardware and spent 10 bucks in brass adapters and as yous tin can see from the picture show I know take a desiccant filter added to the Benjamin Pump. So for 20-thirty bucks in filters and parts you can have a decent filtration system.
This past Sunday I used the pump in its rebuilt condition and all I can say is there is a major difference in its performance. It adds a fiddling more air, runs cooler and smoother to kicking!
So correct now I am only going to utilize it and monitor its condition equally I shoot this summer. I will start taking pictures of ANY changes I make or maintenance performed. Forgot to add, the first time I used the pump the gauge on the pump did not quite match the gauge on the K-Rod. Afterwards the rebuild now they do 
I remember it�south rubber to say it is NOT the best pump in the world, merely it reminded me of the Marauder burglarize itself. Rough effectually the edges in spots, but works overall if taken intendance of. Too, with some possible �custom� work made even more reliable and meliorate. I may polish some internals simply equally not everyone has admission to machining parts, let�s see how it does with regular upkeep.
So my first suggestion if you own one of these pumps is to put a filtration system on it�that appears to be a weak link.
To be continued�
BZ
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