Manitowoc National Crane 1300A Service And Maintenance Manual

HYDRAULIC SYSTEM 1300A
2-12 01-22-2019 Control # 051-08
RELIEF VALVE SETTING PROCEDURE
Hoist and Pump Section P1 Relief
1. Disconnect the two work port hoses at the hoist motor
(Figure 2-5) and cap the hoist motor ports.
2. Plug one hose and attach a pressure gauge to the other
hose.
3. Start the engine. Set the throttle to governed rpm.
4. Try to hoist up or down. Adjust P1 relief valve on the
main control valve (3) (Figure 2-3) to 3300 (+100/-0 psi
(22752 kPa) (+689\-0).
5. Shut down the engine.
6. Remove the pressure gauge and plug from the work port
hoses and reconnect the hoses to the hoist.
Pump Section P2 Relief for Lift and
Telescope
1. Connect a pressure gauge to the quick disconnect in
test port (1) (Figure 2-3) on the main control valve.
2. Start the engine and set throttle to governed rpm.
3. Boom down until the boom bottoms out.
4. Adjust P2 relief valve (6) (Figure 2-3) to 3600 psi
(+100/-0) (24821 kPa) (+689/-0).
5. Shutdown the engine.
6. Disconnect pressure gauge from the test port and
reinstall the cover.
Telescope In and Telescope Out Reliefs
1. Remove the extend and retract (work port) hoses from
the telescope cylinder (Figure 2-6) and cap the
telescope adapters.
2. Attach a pressure gauge to the telescope extend hose
and plug the telescope retract hose.
NOTE: Install a gauge in each line and set the extend and
retract pressures as described below with
telescope control lever.
3. Start the engine and set the throttle to governed rpm.
4. Push the telescope control lever to extend.
5. Adjust the telescope extend relief valve on the main
control valve (4) (Figure 2-3) to 2800 (+100/-0) psi
(19305 kPa) (+689/-0).
6. Shut down the engine.
7. Move the gauge to the retract line and plug the extend
line.
8. Start the engine.
9. Pull the telescope control lever to retract.
10. Adjust the telescope retract relief valve on the main
control valve (5) (Figure 2-3) to 2950 (+100/-0) psi
(20339 kPa) (+689/-0).
11. Shut down the engine.
12. Remove the pressure gauge and plug from the hoses.
13. Reconnect the telescope cylinder hoses.
FIGURE 2-5
Work Port Hoses
FIGURE 2-6
Telescope Cylinder
Work Port Hoses

Manitowoc National Crane 1300A Specifications

General

Brand	Manitowoc
Model	National Crane 1300A
Category	Construction Equipment
Language	English