Question about Crosman (4032)

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Crosman 140 Piston rod replacement parts needed.

I need a replacement for the rubber cup on end of the pump rod for a Crosman 140. Any suggestions where I can find a new one, or a sevicable used one? Any of the other Crosman guns use the same part?

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  • Anonymous Mar 25, 2014

    a parts diagram needed

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I just rebuilt my 140 that I had as a child, Rick had all of the o-rings and pump cup to rebuild it back to new working condition.

Rick Willnecker
Precision Pellet
37 Stoney Lane
New Park, PA 17352
717-382-1481
717-382-4065 Fax
e-mail airgunshop@aol.com
web site www.airgunshop.net

Posted on Mar 02, 2009

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Contact the following person.

http://www.abairgun.com/
Alan Schweitzer
AB Airgun
Box 798
201 North Knox Street
Johnson, Kansas 67855

The process to replace the cup requires an arbor press. See Alan's web site. His rates are VERY low to have him do the work. I've not used Alan yet, but I am preparing to send him my Crosman 140 (c. 1962) for a rebuild. It was my Dad's rifle, now mine. It no longer holds pressure for more than a few seconds.

Richard - in Virginia

Posted on Jun 05, 2009

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The rubber cup can be replaced using a rubber from an old tire of a tractor. shape it using a grinder. that's what we do here in our place.

Posted on May 01, 2009

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How to install replacement packings


I guess you have found out how to do this by now, but if not its quite easy. These instructions apply to all the Graco St series II sprayers, so the repair kit (Graco # 244-194) contains all the parts to service these different sprayers and you may not need them all for your pump. The back of the kit shows the order in which the parts are installed. Follow it carefully.

The first thing to do is open the repair kit and squirt engine oil into the blisters that contain the packings so that the leather packings soak it up while you are working. Note that the kit will not use all the parts, as it is good for several different pumps, so you need to keep a careful watch on which parts you need.

You need to repack the pump with it held in a bench vice, so first remove it from the sprayer: Disconnect the pump output hose and the suction assembly, then push out the pin that holds the piston into the gearbox piston, slacken the locking ring and unscrew the pump.

Grip the inlet valve body (the lower tapered part) in the vice on the 2 flats. Unscrew the main body and set it aside, take the inlet valve housing out of the vice and remove the valve parts, noting the order of them; you will be reusing the valve seat and cage.

Put the main body upright in the vice and remove all the parts: Unscrew the brass packing nut and tap the piston out with a suitable tool, taking care to catch it. Remove the top packings and the O-ring on the end that goes into the inlet valve housing, clean the pump body including the outlet connection, and inspect the inside of the cylinder to check that it is not scored; if it is, you will have to replace it otherwise the scores will tear up the new packings.

I always keep the old packings in a stack to check the order and number of them when I install the new ones later.

Now remove the packings from the piston, keeping the parts together to check the right order when you install the new ones. There's a drawing on the back of the kit but having the real ones on the bench is a helpful check.

Clean the piston rod and check that the end that goes through the top packing is not scored and replace it if necessary. Rebuild the packings onto the rod being careful to use the correct spacer that goes on first; the thick one is for the rod that does not have a wiper at the other end. Do this with the flats in the end of the rod gripped in the vice. The packings must be installed so that the outer lips face up towards the end of the rod with the hole for the piston pin. The packings are three plastic and two leather between them supported at both ends by spacers. Before screwing in the outlet valve housing (the stud) that keeps the packings in place, check that the valve seat is OK, then install the wiper ring if there is one on the stud with the lips facing the opposite way from the other packings. Install the outlet ball and apply some Locktite on the screw threads and screw in the stud until it is firmly tight (Graco says 3 ft-lbs if you have a torque wrench).

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