F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
5 - M
AINTENANCE
PAGE 5-11
Crosshead
Crosshead - Removal
1.
F
IGURE
5-8 C
ROSSHEAD
- T
YPICAL
Locknut
Crosshead-
Balance Nut
Set Screws -
Loosen Before
Turning Nut
End
Plate
Through
Bolt
Bushing
Roll
Pin
Crosshead
Pin
Through
Bolt
Shoe Area
Roll Pin
End
Plate
Loosen all cylin-
der heads to the
Caution note
above to be sure
cylinders are
completely
vented.
2.
Remove cross-
head guide side
covers.
3.
Remove the cyl-
inder head (or
VVCP). In the
case of tandem
cylinders where
the outboard cyl-
inder bore is
smaller than the inboard bore, it is necessary to remove the outboard cylinder.
Support such cylinders during removal and installation, as to not put excessive
weight on the piston and rod assembly which might cause bending.
4.
Turn the crankshaft to position the crosshead to near its inner dead center posi-
tion and back off, but do not remove, the crosshead-balance nut set screws.
Loosen the nut with the special slugging Peg or Open End Wrench shown in
Figure 7-1 on page 7-2, depending on nut style.
5.
Turn the crosshead-balance nut off the piston rod, while removing the piston and
CAUTION
BEFORE REMOVING THE CYLINDER HEAD, BACK OFF ALL
CAP SCREWS 1/8 INCH (3 mm). MAKE SURE THAT THE HEAD
IS LOOSE AND THE CYLINDER IS VENTED. SEE IMPORTANT
SAFETY INFORMATION PLATES ON COMPRESSOR TOP
COVER, REFER TO TABLE 1-4 ON PAGE 1-6 FOR LOCATION.
CAUTION
CROSSHEADS ARE HEAVY. CARE MUST BE TAKEN WHEN
HANDLING TO AVOID PERSONAL INJURY. THE WEIGHT OF
EACH CROSSHEAD IS LISTED IN THE BALANCE SHEET
THAT COMES IN THE MANUAL WITH EACH COMPRESSOR.
!
!
