88
Operating Manual Crawler Excavator TC37
Care and Maintenance
7
7.8.14 Crawler chains
Checking the crawler chain tension
• This check must be carried out on a level surface.
• Slew the uppercarriage by 90° and lift on one side
until the crawler is free above ground.
Tensioning the crawler chain
• Remove the covers on the right-hand and left-
hand side of the crawler frame and re-tension the
crawler chain using the hand grease gun via the
grease nipple (60/1).
• Move the crawler chain and check the crawler-
chain tension again.
Releasing the crawler chain tension
• Slowly loosen the valve (60/2) with the grease
nipple and let grease drain out until the correct
crawler chain tension is obtained.
• Re-tighten the valve using the grease nipple.
• Remove any grease and dispose of according to
regulations.
• Move the crawler chain and check the crawler-
chain tension again.
Fig. 60
Crawler chain tension
a
HR3.7-04-65
Fett
Grease
1
2
grease
• The sag of the crawler chain between lower roller
and crawler chain (Fig. 60, distance "a") should
be:
Steel chain
approx. 0.98 – 1.38 in
Rubber chain
approx. 0.59 – 0.79 in
Attention
in case of new rubber crawler chains.
• Check the sag of the rubber chains on the
first day of operation 2 - 3 times and
retension if necessary.
Danger of injury
due to grease spurting out under pressure.
• Wear appropriate protective clothing and
safety goggles.
• Release the crawler chain tension slowly
and carefully.
