Manitowoc 2250 Service And Maintenance Manual

Reference Only
Manitowoc Published 11-06-15, Control # 040-13 10-59
2250 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
Test 24 — Checking Hydraulic Brake Pressure
The hydraulic brakes for the swing and travel systems
operate off the exhaust pressure from the fan motor system.
The boom/luffing jib brakes are released off low-pressure
side or boom hoist closed-loop system. To check hydraulic
brake pressure for the swing and travel systems:
• Engine must be off and power off, with all brakes and
locks engaged.
• Connect a 0 – 1,000 psi (69 bar) gauge at diagnostic
quick-disconnect fitting on pilot/brake pressure relief
valve between top of engine/radiator and oil cooler fans.
• Start the engine and set at high idle (2,000 rpm).
• Enable desired system brake and check that brake
pressure is 325 to 375 psi (22 to 26 bar).
• If pressure is not within range, adjust the pilot/brake
pressure relief valve.
• Loosen adjusting lock nut.
• Turn adjusting screw clockwise (in) to increase pressure
until correct pressure is obtained.
• Turn adjusting screw counter-clockwise (out) to
decrease pressure until correct pressure is obtained.
• Secure adjusting lock nut.
• Remove the pressure gauge and replace the fitting cap.
• If correct pressure cannot be obtained, replace the valve
assembly.
To check hydraulic brake pressure for boom hoist system:
• Engine must be off and power off, with all brakes and
locks engaged.
• Connect a 0 – 1,000 psi (69 bar) gauge between the 90°
elbow on the control valve and the flexible hose.
• Start the engine and set at high idle (2,000 rpm).
• Enable boom hoist system brake and check that brake
pressure is 325 to 375 psi (22 to 26 bar).
• If equipped with luffing jib, system brake pressure is 500
to 550 psi (34 to 38 bar).
• If pressure is not within range, check the boom/luffing jib
hoist charge pressure in Test 17 — Checking Pump
Charge Pressure and Electrical Test.
Item Description Item Description
1 Pilot/brake pressure relief valve 4 90 degree elbow
2 Test port (adjusting screw on opposite side) 5 Flexible hose
3 Boom hoist brake control valve
3
P970
P924
5
4
2
1
Swing and Travel Systems Boom/Luffing Jib System

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English