M
AINTENANCE
& I
NSPECTION
C
HAPTER
9
9-27
THP 94/42 R 4 XXT
THP 125/42 R 4 XXT
THP 140 H/42 R 4 XXT
GB-07.2005
min. 0,1 mm
max. 0,5 mm
Fig. 9.19 Checking the backlash in the slewing gearbox
Boom backlash
Fig. 9.20 Checking the boom backlash
min.
max.
Fig. 9.21 Measurement points for checking the boom backlash
9.8.5
Checking the backlash in the slewing gearbox
The backlash is checked as follows:
1.
Remove the pinion gear cover.
2.
With the boom in the horizontal position, slew it slightly
until a tooth is engaged without play.
3.
Insert a feeler gauge to measure the engagement
clearance as shown in the adjoining diagram.
4.
If the backlash is excessive, the gearbox and the ball
bearing slewing rim must be adjusted by a skilled fitter.
9.8.6
Checking the boom backlash (ball
bearing slewing rim in the slewing
gearbox)
Boom backlash means the increased play between outer
ring and inner ring of the ball bearing slewing rim in the
slewing gearbox.
•
The calculation of boom backlash may only be
performed by a specialist authorised workshop.
•
The measurement must be performed at 2 points (loa-
ded side and unloaded side) as shown in the diagram
alongside.
