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TM-5-3895-373-20 Bituminous Distributor Body M918 Model D-63 Manual | Next
1.21. ELECTRICALLY CONTROLLED HYDRAULIC CIRCUITS |
TM 5-3895-373-20
1.20.2. Track
Tensioning
System.
The
track
tensioning system consists of the right auxiliary hydraulic
pump, 50/50 flow divider, hydraulic cylinders, and
pressure relief valves.
The track tensioning system operates by maintaining a
pressure of 900 (6205 kPa) psi on two hydraulic
cylinders. The hydraulic cylinder pushes on the idler
roller to maintain track tension.
The right auxiliary hydraulic pump contains two pumps,
0.7 and 0.58 cu in. (11,5 and 9,5 cc) outputs, mounted
on a
common shaft. The 0.58 cu in. (9,5 cc) output pump
supplies oil to a 50/50 flow divider. The flow divider splits
the hydraulic flow, sending half to the stack valve.
When the oil enters the stack valve, overpressure
protection is provided by a 2500 psi (17 240 kPa) relief
valve. The hydraulic oil exits the stack valve through the
power beyond valve. When any stack valve function is
used, the power beyond valve shifts and redirects
hydraulic flow to the stack valve supply header. This
removes hydraulic flow from the track tensioning system.
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