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Master Brake Cylinder
TM-10-3930-620-34 Truck Lift Fork Solid Rubber Tired Wheels 6000 Capacity 180 Inch Lift Manual
Figure 3-46. Seat brake, exploded view.
d. Cleaning and Inspection.
(7) Clean cylinder body using clean, soapy
Caution: Do not use mineral base cleaning
(8) Rinse cylinder body using clean, warm
solvents  such  as  gasoline,  kerosene,  carbon
tetrachloride, acetone, paint thinners, etc., to clean
Warning: Wear suitable eye protection when
rubber parts.
using compressed air.
(1) Clean all master brake cylinder internal
(9) Dry cylinder body using compressed air.
parts using a lint-free cloth dampened in clean denatured
(10) Insure that intake port and bypass port
alcohol or hydraulic brake fluid.
passages are free of burrs, dirt, and other foreign matter.
(2) Remove dirt, metal filings, sludge, and
(11) Submerge cylinder body in clean hydraulic
other foreign matter from cylinder and tank and external
brake fluid.
cylinder parts.
f. Reassembly. (fig. 3-45.)
(3) Inspect cylinder bore for deep blemishes.
Note. If cylinder bore has been honed, insure
(4) If deep blemishes are found, cylinder shall
that new parts contained in repair kit are installed.
be honed and all new parts contained in repair kit will be
(1) Insure that all master brake cylinder
installed (sub-para e).
internal parts and cylinder bore have been coated with
(5) Inspect cylinder for pressure marks and
clean hydraulic brake fluid.
Caution:  Do  not  use  emery  cloth  or
Caution: Do not distort or crack cylinder
sandpaper to polish affected area.
body when securing cylinder in vise.
(6) If pressure marks and discoloration is
(2) Secure hydraulic master brake cylinder in
found, polish affected area using crocus cloth.
(7) Insure that intake port and bypass port
(3) Insure  that  large  end  of  spring  is
passages are free of burrs, dirt, and other foreign matter.
positioned as shown in figure 3-45 before installing valve
(8) Using a piece of soft, iron wire, probe
assembly (8) and spring assembly (7).
bypass port passage to insure that passage is open.
(4) Install  valve  assembly  and  spring
(9) Inspect all parts for corrosion.
assembly in bore of cylinder body.
(10) Inspect  piston  bearing  surfaces  for
(5) Place primary cup (6) in cylinder bore and
scratches or pitting.
install piston assembly 15).
(11) Inspect rubber parts for deterioration,
(6) While compressing spring and piston
swelling, softening, tackiness, and lack of spring-
assembly, install piston plate 14) and lockwire (3).
(7) Insure that lockwire is seated in groove in
(12) Replace all parts which appear to be worn
end of cylinder.
or damaged.
(8) Install gaskets (9 and 10), outlet fitting
e. Repair.
(11), fluid passage bolt, and stop light switch in outlet
(1) Insure that master brake cylinder has
end of cylinder.
been cleaned in accordance with subparagraph d.
(9) Position boot (2) on push rod end of
(2) Apply a coating of clean hydraulic brake
fluid to walls of cylinder bore.
(10) Insert piston rod (11 through opening in
boot and insure that end of piston rod is seated in
Caution:  Do  not  distort  or  crack
piston assembly.
cylinder body when securing cylinder in vise.
(11) Install nonmetallic washer (13) and filler
(3) Secure hydraulic master brake cylinder in
cap (12) but do not tighten.
(12) Remove cylinder from vise.
Note. Before honing cylinder bore, become
3-33. Seat Brake (fig. 3-46.)
familiar  with  honing  equipment  manufacture's
a. General.
operating and servicing instructions.
(1) The seat brake is an enclosed, two-shoe,
(4) Using
mechanically operated brake, mounted on the drive
scratching, pitting, etc., from cylinder bore in single
motor armature shaft. The seat brake is actuated
through spring pressure and mechanical linkage which is
(5) After each pass is completed, visually
attached to the seat brake actuating cam. When spring
check cylinder bore for the absence of scratching,
pressure is applied to the actuating cam. pressure is
pitting, etc.
applied to the actuating arms, which move the brake
(6) If scratching, pitting, etc., is deep or
shoe linings in contact with the brake drum. As the spring
excessive and master brake cylinder bore would have to
pressure is removed front the actuating cam, the brake
be honed oversize (greater than 1.0070 inches), replace
shoes are returned to the neutral position by the brake
shoe return springs.

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