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10 307906
Service
NOTE: Clean and inspect all parts for wear or damage
when disassembled. Replace parts as needed. Repair
Kit 247431 is available. For the best results, u se all
the parts in the k it. Parts included in the kit are marked
with an asterisk in the t ext, figures, Parts D rawing,
and Parts List.
Intake Valve
See the Parts Drawing on page 13.
1. Relieve the pressure.
WARNING
To reduce the r isk of s e rious injury whenever y ou
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
2. Unscrew the v alve hous ing (21). Remove the
o-ring (22*), ball (23), and r etainer (20).
3. Inspect the par ts for wear or damage. If the ball is
nicked, replace it. Apply liquid sealant to the male
threads, and reassemble.
Air Motor
See Fig. 3.
1. Relieve the pressure.
WARNING
To reduce the r isk of s e rious injury whenever y ou
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
2. Remove the air hose and fluid hoses.
3. Place the air motor base ( 5) in a vise.
WARNING
To reduce the r isk of injur y from trapped air pres-
sure when s ervicing the air motor , always remove
air cap (2) from air cylinder (4) before removing a ir
cylinder from base (5).
4. Remove the air c ap (2). Gently pry the coils of the
spring (17) to remove the spring. Check the s pring
for wear or damage, and replace as needed.
5. Use a strap wrench to unscrew the air cylinder (4)
from t he base (5).
6. Unscrew the air piston assembly (15) from the
piston rod (10). Use pliers on the air exhaust plate
(15c*) and a wrench on the piston rod. See the
Piston Detail in F ig. 3.
NOTE: Old, cured thread sealant on the piston rod
threads makes it necessary that you use tools to
remove the air piston assembly from the piston
rod. Do not use these tools when you screw
the air piston assembly onto the piston rod.
7. Disassemble t he air piston assembly (15). See the
Piston Detail in F ig. 3. Clean all parts, and inspect
them for wear or damage. If any v alve plate
spacers are damaged, replace all three in order to
mainta in t he correct clearance bet ween t he valve
plates and seals.
8. Check the spring (8) for wear or damage, and
replace as needed.
9. Apply sealant, such as LoctiteR green, to the
threads of the s crews. Assemble the par ts as
shown in the Piston Detail in F ig. 3. Torque the
screws to 10 to 14 in-lb (1.3 t o 1.6 N-m).
Displacement Pump
See Fig. 3, and see the Parts Drawing on page 13.
WARNING
Do not cycle the pump with any parts disassemb-
led. See the M oving Parts Hazard on page 4.
1. Use a strap wrench on t he f luid cylinder (24) to
unscrew it from the m otor base ( 5). Pull down on
the piston rod (10) until you hav e access to the
fluid piston assembly (19).
2. Stand the fluid piston assembly (19) in a vise, and
remove the piston rod (10).
3. Unscrew the fluid piston (19) from the piston
rod (10), and be careful not to drop the ball (18).
Remove the piston rod the rest of the way f rom the
base.
4. Remove the shaft seal (16*), wiper ring ( 11*), and
the gasket (9*) from the top of the motor base ( 5).
5. Reach inside the opening of the air motor base ( 5)
to remove the o-ring (26*). Carefully remove the
wiper ring (11*) and the seal (12*) from the m otor
base.
6. Carefu lly ins pect the smooth inner s urface of the
fluid cylinder (24) for scoring or irregular surfaces.
Such damage causes premature packing wear and
leaking, so replace the part if needed.
7. Lubricate and install the new shaft seal (16*),
wiper ring (11*), and gasket (9*), seal (12*), wiper
ring (11*), and o-ring (26*) into the base.
8. Lubricate t he new seal (19b*), and install i t o n the
fluid piston (19c).
9. Install washer (19a) onto fluid pis ton (19c).