Alfa Laval Toftejorg TZ-79, Instruction Manual, Page: 41 / 48

Trouble Shooting Guide
(continued)
Possible causes Action
e). Gearbox jammed/sluggish
Remove foreign material from Gearbox. Check
rotation of shafts. If restriction is recognized,
disassemble Gearbox (see page 28) and remove
material build-up, especially on 2nd stage Worm
wheel and mating Collar bushes.
f). Hub jammed/sluggish
Disassemble Hub Subassembly (see page 24).
Remove foreign material inside Hub. Clean Ball
races and Ball retainer with balls. Also clean nose
of Body.
Wear
a). Slide bearings See page 18.
b). Main bush See page 19.
c). Worm wheels See page 19.
d). Collar bushes See page 18.
e). Turbine shaft Check clearance in Main bush and in Slide
bearing. Transverse movement should not exceed
0,5 mm. Also inspect worm wheel for wear.
f). Horizontal shaft
Check clearance in Collar bushes. Transverse
movement should not exceed 0.5 mm. Also inspect
worm for wear.
Mechanical defects
a). Worm wheel/Teeth broken Replace Worm wheel.
b). Worm wheel can rotate on Horizontal
shaft/Pinion due to damaged driver faces
Replace Worm wheel.
c). Damaged teeth on Bevel gear Inspect teeth on Stem and Bevel gear for
deformation. Mount Hub and Stem in Body (see
page 24 and 26). Hold Body in upside down
position and rotate Hub to check that Bevel gears
can work together. If damaged: Replace Stem
and/or Bevel gear.
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