Komatsu 930E-2 Shop Manual page 342

49. Disconnect the hose (5, Figure 4-4) that supplies
oil to the brake valve ("P1" port), rear brake circuit,
by removing at the tee attached to the bottom of
the hydraulic cabinet (brake manifold port "AR1").
Cap the tee fitting, but hose must be vented to
atmosphere.
50. Start engine and allow low brake accumulator
pressure (LAP1 gauge) to stabilize at or above
2700 psi (18,613 kPa).
51. Depress the brake pedal very slowly until the brake
differential pressure switch activates the low brake
pressure lamp and buzzer.
Verify fault indicators are activated at:
Refer to Table I Pressures.
* Record Pressure on data sheet.
52. Shut down the engine and turn key switch OFF.
Allow steering accumulators to bleed down.
Open both accumulator bleeddown valves and
bleed entire brake system.
Close valves after all pressure is released.
53. Reconnect hose (5, Figure 4-4) to Tee at "AR1"
port, bottom of hydraulic cabinet.
54. Remove all test equipment and verify all hoses
have been reconnected.
NOTE: If hoses (4, Figure 4-5) and (10) are switched,
the rear brakes will be slow to apply and slow to
release.
J4-8
FIGURE 4-5. REAR BRAKE HOSES
1. BS - Left & Right Brake Cooling Oil Supply
2. LBR - Left Brake Cooling Return Line
3. T - Return To Tank
4. P1 - Pressure Inlet From Accumulator
5. Axle Housing
6. Wheel Motor
7. RBR - Right Brake Cooling Return Line
8. RBP - Right Brake Pressure Test Port
9. LBP - Left Brake Pressure Test Port
10. PX - Pilot Inlet/Brake Apply Line
11. PB - Parking Brake
Brake Circuit Checkout J04025