BOOM
600H SERVICE MANUAL
4-26
08-19-2022 Control # 092-13
3.
Remove any plug or fitting that is in the retract port in the
cylinder butt plate. Using a special drive tool, drive the
packing gland into the barrel assembly to expose the
round cross section retaining ring. Then use a small
needle nose locking plier to clamp the round cross
section retaining ring to prevent it from rotating in the
groove. Use two straight blade screw drivers: one to pry
the end of the ring out of the groove and the other to pry
the ring out of the barrel assembly.
4.
De-burr ring groove edge after removing round ring.
Failure to do so will damage packing gland and or barrel
assembly when packing gland is removed.
5.
Plug retract port in the cylinder butt plate with SAE #8 O-
Ring boss plug and pull on the rod assembly to force
packing gland out of the barrel assembly.
6.
If step 5 fails to break packing gland loose from the
barrel assembly, remove the plug from the retract port
and plug the extend port in the cylinder butt plate (SAE
#8 O-Ring boss). Apply retract pressure to cylinder to
break packing gland loose. Remove holding valve and
extend and retract plugs from butt plate and pull packing
gland out by hand.
7.
As soon as the packing gland is sufficiently loosened,
properly support the rod assembly and carefully remove
it by hand. Place rod assembly on supports. Exercise
caution in the support and removal of the rod assembly
as damage to the chrome surface requires rod assembly
replacement.
8.
Disassemble the piston set by removing nut, replace
worn or damaged parts.
NOTE:
Loctite 680 is used during original assembly to
secure nut to shaft.
9.
If necessary, heat nut to 400-500° F (204-260°C) to
facilitate removal. If heat is necessary for removal,
discard nut and replace with new equivalent nut as well
as worn or damaged parts.
10.
Wipe and inspect all cylinder internal and external
surfaces for damage.
11.
Remove seals and bearings from packing gland and
piston. Replace all seals and bearings.
12.
Inspect wear pad on barrel assembly and replace as
required.
Telescope Cylinder Assembly
1.
Reassemble shaft and piston set in the proper order with
internal round section ring, packing gland, stop tube,
piston to shaft o-rings, piston, and locknut. Loctite
locknut onto shaft using type 680 according to Loctite
recommendations. Torque locknut to 300 ft-lbs (407Nm).
2.
De-burr ring groove edge in barrel assembly and inspect
all internal and external surfaces for damage. Failure to
do so will damage packing gland and or barrel assembly
when packing gland is installed.
3.
Grease piston assembly and install the shaft assembly
with piston, o-ring, stop tube, packing gland, internal
round ring into barrel assembly.
4.
Using special drive tool, drive the packing gland into the
barrel assembly.
5.
Insert one end of round ring into groove in barrel
assembly and spiral the ring into groove with straight
blade screw driver.
6.
Cycle test cylinder to ensure no leaks exist. Support end
of cylinder as it extends and retracts.
JIB INSTALLATION AND ADJUSTMENT
1.
Loosely bolt the two ear assemblies with shims and bars
as shown to the side of the first boom section.
NOTE:
All measurements are in inches (mm).
2.
Loosely bolt the hook assembly to the side of the first
boom section.
3.
Extend the boom approximately one foot (300 mm).
3/4” Grade 5
(Typ 4 Plcs)
0.38 (10) Bar
0.38 (10)
Bar
0.06 (1.6)
Shims
0.38 (10)
Bar
0.06 (1.6)
Shims
FIGURE 4-15
Typ 4 Plcs
FIGURE 4-16
REFERENCE ONLY
Summary of Contents for 600H
Page 1: ...Service Manual National Crane 600H R E F E R E N C E O N L Y...
Page 6: ...THIS PAGE BLANK R E F E R E N C E O N L Y...
Page 136: ...BOOM 600H SERVICE MANUAL 4 62 08 19 2022 Control 092 13 R E F E R E N C E O N L Y...
Page 231: ...R E F E R E N C E O N L Y...
Page 232: ...R E F E R E N C E O N L Y...
