Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 10-57
999 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
Test 25 – Adjusting Accessory Pressure Switch
In setup mode, when an accessory valve main spool shifts,
the supply flow passages of other accessory valves are
blocked, stopping fluid to accessory pressure switch. The
normally closed accessory pressure switch trips at 120 psi
(8.3 bar) and sends an input signal to the PC to stroke the
low-pressure side of rear drum pump to enable the selected
valve component.
To test the pressure switch trip pressure:
• Disconnect pressure switch (item 4) at rotating frame
swivel (item 1).
• Install a manual hydraulic pump and a 0 – 600 psi (42
bar) gauge.
• Remove DIN connector and install hydraulic/brake valve
adapter cable with meter.
• Switch should open at 120 psi (8.3 bar).
• If an adjustment is necessary, turn adjusting screw (item
3) at back of switch.
Item Description
1 Rotating Frame Swivel
2 Electrical DIN Connector
3 Accessory Pressure Switch Adjusting Screw
4 Accessory Pressure Switch
2
P1488
3
4
1

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English