Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 2-15
999 SERVICE/MAINTENANCE MANUAL HYDRAULIC SYSTEM
2
Pump Pressure
The pump pressure screen (Figure 2-12) cycles through the
hoist pumps to make sure each pump is capable of
producing 6,000 psi (414 bar).
CAUTION: Only perform this high pressure test when
absolutely necessary and by a qualified service technician.
To check pump pressure calibration, proceed as follows:
1. Access calibration screen (see Accessing Calibration
Screens).
2. Turn PARK ON for all crane functions (drums, boom
hoist, swing, travel).
3. Start engine and run at:
• HIGH IDLE, field personnel.
• 1,500 rpm, MCC assembly personnel when
checking out a new crane.
Testing will not start if engine is not running
faster than 900 rpm.
NOTE: Pump pressure test will not start if engine is not
running. Testing will stop if engine speed is
decreased during procedure.
4. When testing starts, the percent (%) of completion is
displayed on screen.
5. Check binary number in screen when calibration is
done:
a. If 0 appears, all items have passed.
b. If any number other then 0 appears, use Table 2-10.
to determine which items have failed.
WARNING
High Pressure Hazard!
This test generates maximum pressure in the main
hydraulic circuits. Defective brakes may allow unintended
motion during test. Move the crane to an area where such
motion is not a hazard.
Use a signal person to monitor functions operator cannot
see.
Be prepared to stop engine if unintended motion occurs.
HYD SYSTEM CHECK
* PUMP PRES 0% 15
FIGURE 2-12
Binary
Number
Percent
Complete
Binary
Number
Calibration Item
1 Front Drum
2 Rear Drum
4 Boom Hoist
8 Auxiliary Drum
16 Travel Right
32 Travel Left

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English