Crawler Replacement And Tension Adjustment - Kubota U20-3 Workshop Manual

U20-3, U25-3 WSM
e. Crawler replacement and tension adjustment
Rubber crawler
Idler
Iron crawler
Idler
No. Part No.
1 RB411-2181Δ
RB611-2181Δ
2 RB411-2182Δ
RB511-2182Δ
Additional parts required for replacing the rubber crawler with the
iron crawler
(To be removed when changing the iron crawler back to the
rubber crawler)
DANGER
To avoid serious injury or death:
• Do not work under the machine in this
condition.
• For your safety do net rely on hydraulically
supported devices, they may leak down
suddenly drop or be accidentally lowered.
Seam joint
Upper roller
Part name. Q'ty Remarks
Plate (sliding) 4 U-20-3
Plate (sliding) 4 U-25
Guide (crawler) 4 U-20-3
Guide (crawler) 4 U-25
IMPORTANT:
•
•
•
•
II-S-52
Machine body (Service section)
Move the rubber crawler until the joint
marking (∞) comes at the top center
(see left) and the upper roller comes
between the links.
Sprocket
Sprocket
Make sure that on obstacles, such as stones
are caught in the crawler. Remove such
obstacles before adjusting the crawler tension.
Crawler seam
The ends of the rubber crawler are joined with
a seam. When adjusting the crawlers, the
seam must be positioned on the top centre
between the idler and the sprocket.
If the seam is positioned incorrectly, the
crawlers will be tensioned to loosely, and a
further readjustment will be necessary.
Rotate the crawler after adjustment one to two
times to check the tension.
Additionally following points are to be
observed when adjusting rubber crawlers.
(1) If the crawler slackens more than 25mm.
readjust them.
(2) Check crawler tension 50 hours after initial
use and readjust if necessary. Check and
adjust thereafter every 50 service hours.