CHAPTER 4
CRANE HYDRAULIC SYSTEM REPAIR INSTRUCTIONS
Section I. CRANE HYDRAULIC MASTER CYLINDER ASSEMBLIES
130. General
132.
Crane Hydraulic Master Cylinder Assembly
The master cylinder piston is connected to the brake
control lever through linkage and when force is applied to
Cleaning, Inspection, and Repair
the brake control lever it is transmitted to the master
cylinder piston. The piston forces the fluid under
a. Cleaning. Clean all parts with an approved
pressure through the lines into the clutch cylinder, which
cleaning solvent and dry thoroughly. Cleanliness is of
moves the piston in the clutch cylinder outward actuating
extreme
importance
when
repairing
hydraulic
the clutch. When the master cylinder control lever is
components.
released or set in neutral position the clutch release
springs return the displaced fluid to the master cylinder.
b. Inspection and Repair. Inspect all parts for
The boom hoist master cylinder bore is 1 inch; main hoist
excessive wear or damage. Replace or repair all
master cylinder, 11/2 inches; the power down master
defective parts.
cylinder, 134 inches.
133.
Crane Hydraulic Master Cylinder Assembly
131.
Crane Hydraulic Master Cylinder Assembly
Reassembly and Installation
Removal and Disassembly
a. Reassembly. Reassemble the master cylinder
a. Removal.
Remove
the
master
cylinder
assembly in the reverse of the numerical sequence as
assembly (TM 5-3810-207-20).
illustrated on figure 33.
b. Disassembly. Disassemble the master cylinder
b. Installation. Install the master cylinder assembly
assembly in numerical sequence as illustrated on figure
(TM
5-3810-207-20).
Section II. CRANE CLUTCH HYDRAULIC CYLINDERS
a. Removal. Remove the crane clutch hydraulic
cylinder assembly (TM 5-3810-207-20).
actuated. Each clutch cylinder has a companion master
cylinder. When actuating the control lever, hydraulic fluid
b. Disassembly. Disassemble the crane clutch
is displaced from the master cylinder passing through a
hydraulic cylinder assembly in numerical sequence as
copper line, shaft rotating gland, main shaft fluid hose,
illustrated on figure 34.
and into the clutch cylinder. The piston in the clutch
cylinder then moves outward to actuate the clutch.
When the control lever is released or set in neutral
136.
Crane Clutch Hydraulic Cylinder Assembly
position, the clutch release springs return displaced fluid
Cleaning, Inspection, and Repair
to the master cylinder.
a. Cleaning. Clean all parts with an approved
135.
Crane Clutch Hydraulic Cylinder Assembly
cleaning solvent and dry thoroughly.
Removal and Disassembly
TAGO 5030A
73
