9
4. Carefully pry brake spring up evenly with a
screwdriver until spring is about halfway off
to remove it. Using brake spring spreader
(Image 12), take out spring from brake arms.
5. Take out brake shoes. Make sure not to lose
steel fulcrum balls.
6. Take out steel balls from recesses sides of
upper brake.
Removing control head assembly
1. Take out six socket head screws and lift assembly from frame to remove control head
assembly.
2.
Lift muffler and screen from recess in control head housing.
3. Take out control cylinder assemblies from each side of control head housing (Image 20).
Then remove valve springs, spring guides and “O” ring seals from valve bore at each side
of housing.
4. The throttle valve is retained in the control head by the valve shifter pin. The pin is
assembled with Loctite on the threads and should not be removed during routine
servicing. Use a hex key to remove pin from bottom of throttle valve if valve is to be
removed (See Image 19). Then remove the valve from bushing in housing. The throttle
valve bushing is pressed into place and honed to provide a .0001 to .0003-inch clearance
with valve. The housing and bushing assembly should be replaced along with the valve if
bushing is scored, worn, or otherwise damaged.
5. Take out air inlet swivel body and bushing from
top of housing. Retain bushing gasket for reuse.
Pull strainer screen from housing bore.
6. Take out retaining ring from bottom of swivel
body and pull off bushing. Take out “O” ring seal
from its groove in bushing.
7. Remove cylinder lock ring to disassemble con-
trol cylinder (pendant throttle control models).
Cylinder and cap will come off with lock ring. Lift
out spring. Then remove piston and seal
assembly from cylinder. Piston shaft “O” ring
seal and retainer washer will drop out as piston
is removed.
Image 10 Driving spring in from
control lever and shaft
Image 11 Removing control shaft
Image 12
Image 13 Removing control head
