Manitowoc National Crane NBT30H-2 Service Manual

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National Crane 03-20-2019 Control # 613-06 2-17
NBT30H-2 SERVICE MANUAL HYDRAULIC SYSTEM
5. Shutdown the engine and disconnect the pressure
gauge and reconnect the outrigger retract line.
Outriggers Beam Extend
1. Select an outrigger and remove the extend line from the
outrigger extend cylinder.
2. Install a pressure gauge in the extend line (Figure 2-8).
3. Start the engine and set the throttle to governed RPM.
4. Activate the extend function for the selected outrigger.
Verify the relief pressure is 6895 +345/-0 kPa (1000 +50/
-0 psi). The relief valve (1) for the outrigger circuit is
located on the front outrigger control manifold,
Figure 2-9. Remove the cap on the relief valve to access
the adjustment screw.
5. Shutdown the engine and disconnect the pressure
gauge and reconnect the outrigger extend line.
Center Front Outrigger
1. Disconnect the front outrigger extend and retract lines
(Figure 2-10). Cap the retract line and install a gauge in
the extend line.
2. Start engine and set at governed RPM.
3. Depress the front outrigger extend/retract switch to
extend.
4. Adjust the extend relief valve on the front outrigger port
block to 3447 kPa +689/-0 (500 psi +100/-0).
5. Shut down the engine.
6. Remove the gauge from the extend line and install in the
retract line. Cap the extend line.
7. Adjust the retract relief valve on the front outrigger port
block to 12065 kPa +689/-0 (1750 psi +100/-0)
8. Shutdown the engine, remove the gauge and cap, and
reconnect the SFO hydraulic lines.
Outrigger
Relief
Valve
Pump
Manifold
FIGURE 2-6
Extend Hose
FIGURE 2-7
Retract Hose
Beam Extend
FIGURE 2-8
Outrigger Extend
Beam/Outrigger
Retract
1
FIGURE 2-9

Manitowoc National Crane NBT30H-2 Specifications

General

Brand	Manitowoc
Model	National Crane NBT30H-2
Category	Construction Equipment
Language	English