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FAN GEARBOX (Cont’d)
853, 853H BICS Service Manual #6724012 – Engine Service Section Part 1 of 4
Checking Backlash
NOTE: For procedures requiring the use of LOCTITE
adhesive, thoroughly clean and dry affected
parts before the application of LOCTITE.
The backlash tolerance between the gears should be
0.005–0.008 inch (0,127–0,203 mm).
To check the gear backlash use the following procedure:
Put the short housing in a vise, square flange facing up
as shown [A].
Install the same size and number of square shims (if
present during disassembly) between the two housings
[B].
Set the long housing on the short housing with a small
amount of liquid adhesive (LOCTITE #242) between the
mounting surfaces.
NOTE: If square shims are used, put a small amount
of the liquid adhesive on both sides of all
shims.
Install the four mounting bolts through the flange holes
[C].
Install the part number tag [C].
Install and tighten the nut to 25–28 ft.–lbs. (34–38 Nm)
torque.
Install the long key (Item 1) [D] and the pulley (Item 2) [D].
Install a bolt in the set screw hole to maintain a 1.000 inch
(25,4 mm) distance from the shaft center to the bolt head
(to be used with a dial indicator) [D].
A
B
C
Part Number
Tag
D
1
1.000 inch
(25,4 mm)
2
P–02987
P–02981
P–02983
P–02984
853, 853H BICS Loader
–7–25– Service Manual