MAXPRO TECHNOLOGIES, INC.
7728 Klier Dr.
Fairview, Pa. 16415
Phone: 814-474-9191
Fax: 814-474-9391
REPAIR AND REBUILD MANUAL
for
AIR AMPLIFIER
Model #
GPLV2
DIS-ASSEMBLY
1. Remove snap ring, #17, from the spool valve housing, # 9.
2. With a long screw driver or wooden dowel, from the ½" FNPT side of the housing, #9, push
out the spool plug, #15, and spool, #12, from the housing.
3. Remove the four (4) cap screws, #21, that hold the housing to the top cap, #1, and remove
housing.
4. Holding the housing in a vise, use special tool, P/N 101-0033, to remove the spool sleeve,
#10, from the housing.
DO NOT SCRATCH THE BORE OF THE SLEEVE.
5. Remove both tappet screws, #2, from both ends of the amplifier. With needle nose pliers,
remove the springs, #4, and tappets, #5 from the end caps
6. Using a 3/4" socket or open end wrench, remove the four (4) tie rods, #50, and pull both end
caps away from the air cylinders, # 28 and #48.
7. Push either of the air pistons, #43, all the way to one side, on the side where the piston is
closest to the center air separation plate, #29, tap on the outside of the air cylinder, #28 or
#48, near the end, with your hand or a soft hammer, and remove cylinder from piston.
Push the piston to the opposite side and repeat the procedure to remove the other
cylinder.
8. Using a 15/16" socket and open end wrench, remove one of the nuts, #45, from the piston rod,
#41, and remove the piston from the rod. Both pistons do not have to be removed from
the rod. Pull the piston and rod from the center air separation plate, #29.
9. Remove the snap rings, #36, that hold the four (4) check valve assemblies in place and remove
the check seats, #30, O-Rings, #31, plates, #32, springs, # 33, holders, #34, and retainer
rings, #35.
10. Remove all old O-Rings and seals. Clean all other parts in mineral spirits to remove all dirt
and grease.
NOTE!!
Before re-assembling, inspect
all
parts for damage, such as scratches on the
bores of cylinders and spool sleeves and surfaces of the piston rod.
ASSEMBLY
1. Start with the check valve assemblies. Refer to the attached drawing 3630.0658 for an
expanded view of the parts and their orientation for proper order of assembly.
Use a small amount of grease on all O-Rings. Note that the angle side of the seats face the
plate. The two (2) check valve assemblies that are on the inlet, or “A” side, have the seat
installed first, then the O-Ring, check plate, spring, holder, retaining ring and snap ring.
On the outlet, or “B” side, the order is opposite, starting with the holder, then the spring,
check plate, O-Ring, seat, retaining ring and snap ring.
