8. Locate the clutch hub and armature assembly on the end
of the engine shaft. Note the two set screws as well as
the unused, threaded hole in the taper lock bushing at the
center of the clutch hub.
9. Using an 1/8” hex wrench, remove the two set screws
from the taper lock bushing
10. Thread one of the set screws into the unused, threaded hole
on the taper lock bushing. As the screw tightens, the bushing
will loosen. Once the bushing has loosened enough, slide the
clutch hub and armature assembly off the engine shaft.
11. Before replacing the clutch
hub and armature assembly
the proper “set back” must
be created. Using the
SprayTECH hub set-up tool
(P/N 0509925), create a “set
back” of 0.20” between the
friction surface of the clutch
armature and the forward face of the clutch hub.
12. Line up the three holes in the taper lock bushing with the
three holes in the clutch hub and insert the bushing into
the center of the clutch hub.
13. Line up the key on the taper lock bushing with the keyway
on the engine shaft and slide the assembly onto the shaft
with the holes facing out.
14. Apply blue Loctite to the
two set screws and insert
the screws into the taper
lock bushing. Tighten the
set screws only two turns
at this time.
15. Line up the forward face
of the clutch hub with the
front face of the clutch
housing. Using an 1/8”
hex wrench, alternately
tighten the set screws
into the taper lock bushing. Torque to 65–75 in/lbs.
16. Make sure the friction surface of the clutch armature is
clean and free from oil or grease.
Removing the Clutch Rotor, Clutch Field, and
Drive Shaft Assembly
1. Follow steps 1–7 in “Removing/Replacing the Clutch Hub
and Armature Assembly.”
2. Locate the clutch rotor assembly on the end of the drive shaft
assembly. Note the locations of the three socket screws and
the two empty, threaded holes on the clutch rotor.
3. Using a 3/16” hex wrench, remove the three socket
screws and lock washers that secure the clutch rotor to
the drive shaft assembly.
4. Thread two of the socket screws into the empty, threaded
holes and tighten alternately. This will push the clutch
rotor away from the drive shaft assembly and pinion.
Electrostatic discharge (ESD) potential could cause
damage to electronic pressure control. Use SprayTECH
ESD wrist strap P/N 0507958 or equivalent when working
on electronic pressure control.
WARNING
NOTE: To ensure the clutch hub and the clutch
housing are aligned, hold a straight edge
across the face of the clutch housing and then
hold the clutch hub against the back of the
straight edge while tightening the two set
screws into the taper lock bushing.
Clutch
Housing
0.20"
Engine
Set
Screw
Straight
Edge
Taper
Lock
Bushing
NOTE: A new clutch hub and
armature assembly will
come pre-assembled, but
the “set back” will not be
correct. The “set back”
must still be created using
the hub set-up tool.
0.20"
Clutch
Hub
Flat
Surface
Set-Up
Tool
Clutch
Armature
5. Using a Phillips screwdriver, remove the four screws that
secure the EPC assembly to the EPC housing. Carefully
remove the EPC assembly from the housing.
6. Locate the two clutch field wires that pass from the gear
housing into the EPC housing through a grommet in the
back of the EPC housing. Remember the wire connection
terminals on the EPC assembly (label if necessary) and
disconnect the wires. Gently move the EPC assembly
away from the housing and rest it on the work surface by
the control housing.
7. Locate the four set screws that secure the clutch field to
the gear housing. They are located on the exterior of the
gear housing at the 12, 3, 6, and 9 o’clock positions while
facing the clutch field end of the gear housing. Using an
1/8” hex wrench, remove the setscrews. Remember the
location of the two clutch field wires with respect to the
grommet and EPC housing.
8. Carefully slide the clutch field out of the gear housing,
keeping the field square to the gear housing so it does not
bind.
9. Remove the retaining ring in front of the ball bearing
within the center bore of the gear housing.
10. Follow steps 2–6 in the “Replacing the Gears” procedure
to remove the pump housing from the gear housing.
11. From the gear side of the gear housing, use a soft
hammer to tap the gear end of the drive shaft through the
gear housing.
12. Carefully slide the drive shaft assembly out from the gear
housing, keeping the shaft square to the housing so it
does not bind.
13. Remove the o-ring from inside the center bore of the gear
housing from which the small ball bearing on the drive
shaft assembly was removed.
14. Clean the inside of the gear housing.
Installing the Clutch Rotor Assembly, Clutch
Field and Drive Shaft Assembly
1. Install a new o-ring into the center bore of the gear housing.
2. Apply Loctite retaining compound #635 to the outside
diameter of the large bearing on the drive shaft. Do not get
retaining compound on the faces of the bearing.
3. Install the drive shaft assembly into the center bore of the
gear housing, keeping it square to the housing so it does
not bind. Once the large ball bearing on the drive shaft
assembly is half way into its bore, a soft hammer may be
used to gently tap the assembly into position.
Do not force the drive shaft assembly into position.
4. Install the retaining ring into its groove next to the large
ball bearing.
CAUTION
Clutch Rotor
Socket Screw
Retaining Ring
Clutch Field Wires
Drive Shaft
Assembly
Clutch
Field
Clutch Field
Set Screw
EPC
Housing
Lock
Washer
Clutch
Rotor
© SprayTECH. All rights reserved.
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