MAINTENANCE 4.11 EVERY 500 OPERATING HOURS OR QUARTERLY
397
4.11.4 CRAWLER TRACK - INSPECTION
CHECK ADJUSTING RANGE OF GUIDE WHEELS
(Track retensioning range)
GENERAL
The hydraulic track tensioning system, illust. Z 20371 maintains
automatically the correct track tension. The pilot pressure oil of
the travel brake release circuit is used, to pressurize the four
adjusting cylinders (10) and (11). The resulting force moves the
guide wheels toward the front, until the correct track tension is
obtained. External forces acting upon the guide wheels are
absorbed through the pressure accumulators (8A) and (8B).
Legend for illust. Z 20371:
WARNING
Before working on the hydraulic track tensioning system,
relieve all pressure in the system by opening cock (5), posi-
tion ’0’. After finishing the service work close the pessure
relief cock (5), position ’C’.
(1) Rotary distributor
(2) Supply line, pilot pressure from travel brake release circuit
(3) Return oil line (leakage oil)
(4) Valve block
(5) Pressure relief cock for hydraulic track tensioning system.
“C” - Closed (Normal working position)
“O” - Open
(6) Shut-off cock in supply line (if so equipped)
“O” - Open (Normal working position)
“C” - Closed
(7) Two stage pilot pressure operated relief valve
(8A) Pressure accumulator, high pressure (150 bar)
(8B) Pressure accumulator, low pressure (31 bar)
(9) Shutoff cocks, RH & LH
“O” - Open (Normal working position)
“C” - Closed
(10) Track adjusting cylinders, inner
(11) Track adjusting cylinders, outer
(12) Test connectors and vent valves
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