9
NOTE:
Air motor is lubricated with a life tested
synthetic grease (#826733) at the factory. This
grease coats all parts and repels air line
moisture to inhibit corrosion. It is imperative that
any grease removed during routine maintenance
be replaced. Contact your local Balcrank
®
Distributor, using the above part number, for
replacement grease.
PRESSURE RELIEF
PROCEDURE:
Follow this procedure
whenever you shut off
the pump, when checking or servicing any
part of the system and when installing,
cleaning or changing any part of the system.
1 ) Disconnect the air to the pump.
2) Point dispensing valve away from
yourself and others.
3) Open dispensing valve until
pressure is relieved.
WARNING
!
Pump Servicing
Pump Disassembly:
This operation must be
performed before continuing to the following
sections. Grip the upper pump body (20) in
a padded-jaw or smooth-jaw vise. Unscrew air
piston tube (17), with cap (12) attached, from
the upper body. Unscrew the pump tube (30),
with footvalve (34) attached, from the lower body
(26). Place a 1/4” diameter rod through hole at
the bottom of the lower pump rod (7). Use a 7/8"
wrench to unscrew the fluid piston (10) from the
pump rod (7). Remove ball (9) and set aside.
Grip air motor assembly (1) by hand and pull out
the entire assembly (air motor and both pump
rods). Wrap the pump rods to prevent damaging
the surfaces. Keep the lower spring (18) with the
rod.
Upper Body O-ring Replacement:
O-ring (19)
can be removed by using a curved pick or
small-bladed screw driver. Wipe o-ring groove to
remove debris and replace.
Lower Body Seal Replacement:
This seal must
be replaced each time the lower rod is pulled
through the body. The wiper seal (25) is replaced
by removing screws (28) and washers (27) and
separating the upper (20) and lower (26) body
sections. Use snap ring pliers to remove the
retaining ring (23). Remove the backup ring (24)
and seal (25). Apply Balcrank lubricating grease
(#826733) to the seal area and install a new
seal flared side down. Work carefully to avoid
seal tearing around the snap ring groove.
Reassemble in reverse order.
Lower Spring and Air Motor Replacement:
Replace the spring (18) by sliding off the old
spring and sliding on the new part. The air motor
(1) is a 1 -piece, staked assembly that cannot
be disassembled for repair of internal o-rings or
upper seal. Replace the entire assembly using
Balcrank
®
Repair Kit 827711. Wrap the upper
pump rod (2) with protective material or use
wood/plastic blocks to grip it in a vise. Use a
wrench to remove the air motor assembly at
the hex adaptor (1) pump rod (2) joint.
Note:
If
the upper pump rod needs replacement, do so
before the new air motor is installed (refer to
Replacing the Upper Pump Rod). Apply thread
adhesive to the air motor before installation.
Upper Spring and Flat Seal Replacement:
Unscrew cap (12) from air piston tube (17).
Remove screw (16), spring retainer (15) and
spring (14) and lift out upper gasket (13).
Reassemble in reverse order.
Replace the lower
gasket (13) while the tube is off the body (20).
Be sure the new gasket is flat against the body
before assembling the tube.
827764
Retainer Ring
827765
Backup Ring
827770
Seal
827734*
Pump Rod
827730*
Lower Body
* Not Included in Repair Kit
