MAINTENANCE 4.12 EVERY 1000 OPERATING HOURS OR EVERY 6 MONTH
483
4.12.5 HYDRAULIC TRACK TENSIONING SYSTEM - CHECK PRESSURE
ACCUMULATORS
WARNING
Before working on any part of the hydraulic track tensioning
system relieve all pressure in the system by opening pres-
sure relief cock (5), illustration Z 20371.
OTICE
For checking the charging pressure a special testing and fill-
ing device must be used. This device can be ordered from
your Komatsu Dealer.
The testing and filling procedure of the pressure accumula-
tors has to be carried out in accordance with Service Bulletin
No. AH01531.
Legend for illust. Z 20371:
(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
“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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