Section 000-0000
General Information - TR70 Off HighwayTruck
SM 1911 7-00
2
DRIVE AXLE
Heavy duty axle with single reduction spiral bevel gear
differential, full floating axle shafts, and planetary reduction
at each wheel.
Ratios: Standard Optional
Differential....................................... 3.73:1 3.15:1
Planetary......................................... 5.80:1 5.80:1
Total Reduction............................. 21.63:1 18.27:1
SUSPENSION
Front: King pin strut type independent front wheel
suspension by self-contained, variable rate, nitrogen/oil
cylinders.
Rear: Variable rate nitrogen/oil cylinders with A-frame
linkage and lateral stabilizer bar.
Maximum Strut Stroke
Front .......................................................235 mm (9.25 in)
Rear ..........................................................193 mm (7.6 in)
Maximum Rear Axle Oscillation..................... ± 7.5 Degrees
WHEELS AND TYRES
Wheel Rim Width .......................................................... 17 in
Standard Tyres (Front & Rear) ..............24.00 R 35** Radial
Optional Tyres (Front & Rear) ............ 24.00-35 (48 PR) E-3
Note: It is recommended that for tyres both listed and
unlisted, the user should consult the tyre manufacturer and
evaluate all job conditions in order to make the proper
selection.
BRAKES
Service
All hydraulic brake system. Transmission mounted pressure
compensating pump provides hydraulic pressure for brakes
and steering. Independent circuits front and rear. Each
circuit incorporates a nitrogen accumulator which stores
energy to provide consistent braking response.
Front Brake Circuit Pressure ............. 110 bar (1 600 lbf/in²)
Rear Brake Circuit Pressure ....................52 bar (750 lbf/in²)
Accumulators:
Nitrogen Precharge Pressure...............55 bar (800 lbf/in²)
Front:
Type............................ Dry Disc with 2 callipers per wheel
Disc Diameter ............................................710 mm (28 in)
Pad Area, Total.................................... 2 788 cm²(432 in²)
Rear:
Type...............................Oil cooled, multiple friction discs,
completely sealed from dirt and water.
Braking Surface, Total ..................67 390 cm² (10 445 in²)
Parking
Application of rear brakes by springs in brake disc pack.
Hydraulically released.
Hold-off Pressure ..................................83 bar (1 200 lbf/in²)
Retardation
Modulated lever control of rear disc pack.. 670 kW (900 hp)
continuous.
Retarder Actuation Pressure ......... up to 33 bar (480 lbf/in²)
Emergency
Push button solenoid control applies service and parking
brakes. Automatically applies when engine is switched off.
Parking brake applies should system pressure fall below a
predetermined level.
Brakes conform to ISO 3450, SAE J1473 OCT 90.
STEERING SYSTEM
Independent hydrostatic steering with closed-centre
steering valve, accumulator and pressure compensating
piston pump.
Accumulator provides uniform steering regardless of engine
speed. In the event of loss of engine power it provides
steering of approximately two lock-to-lock turns.
A low pressure indicator light warns of system pressure
below 83 bar (1 200 lbf/in²). Steering meets SAE J53.
Relief Pressure ...................................210 bar (3 000 lbf/in²)
Steering Cylinders ................... Double Acting, Single Stage
Accumulator:
Nitrogen Precharge Pressure...............55 bar (800 lbf/in²)
Steering Angle (Left and Right) .......................................42°
Pump:
Type......................................................................... Piston
Capacity at 2 100 rev/min..... 1.75 litres/s (32 US gal/min)
BODY HYDRAULICS
Two body hoist cylinders are mounted between the frame
rails. Cylinders are two-stage with power down in the
second stage.
System Relief Pressure ..................... 190 bar (2 750 lbf/in²)
Pump:
Type........................................................................... Gear
Capacity at 2 100 rev/min..................................6.1 litres/s
(97 US gal/min)
Control Valve ...................... Servo Controlled, Open Centre
Body Raise Time................................................ 13 Seconds
Body Lower Time ............................................ 11.5 Seconds
ELECTRICAL
Type ............................................. 24 Volt, Negative Ground
Battery......... Two, 12 Volt, 165 Ah each, Maintenance Free
Accessories................................................................ 24 Volt
Alternator ..................................................................70 Amp
Starter ........................................................................... 9 kW
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