Manitowoc Grove TMS700E Service And Maintenance Manual page 313

TMS700E SERVICE MANUAL
Operating and Leakage Check
NOTE: Replace malfunctioning or leaking parking brake
valve.
1. Chock the wheels and pressurize the air system.
2. With the park brake valve plunger pulled out (exhaust
position), coat the exhaust port and plunger stem with a
soap solution. A 25 mm (1 in) bubble in five seconds is
permissible. No leakage is permitted between the upper
and lower body.
3. Push the park brake valve plunger in (applied position).
A 25 mm (1 in) bubble in three seconds is permitted.
4. Reduce the air pressure and observe the park brake
valve plunger. It should pop out when the air pressure
drops to about 2.80 bar (40 psi) exhausting the delivery
line and engage the park brakes.
Preventive Maintenance
Every 300 hours, 16,000 km (10,000 mi) or 3 months.
Perform the procedures under the Operating and Leakage
Check.
Quick Release Valve
Removal
1. Chock the wheels and completely depressurize both air
systems.
2. Tag and disconnect the air lines.
3. Remove the two nuts and washers securing the valve to
the mounting studs on the frame and remove the valve.
Disassembly
1. Scribe an index mark across the cover so that the cover
can be reinstalled in the same position.
2. Remove the four screws from the valve cover and
remove the spring, spring seat, diaphragm and O-ring.
Grove
Cleaning and Inspection
1. Clean all parts and inspect the threads, body, and cover
for damage.
2. Inspect the exhaust seat for scratches or pitting.
Assembly
1. Put the spring into the body and the diaphragm over the
spring seat with the flat side of the diaphragm toward the
body.
2. Install the O-ring and cover. Secure the cover with the
four screws.
3. Do the tests as outlined in the Operating and Leakage
Tests.
Installation
1. Position the valve on the mounting studs and secure
with the two nuts and washers.
2. Connect the air lines as per removal tags.
Operating and Leakage Tests
1. Apply and release the brake several times and check for
prompt response of brake chambers.
2. Remove the exhaust port fitting and coat the exhaust
port with a soap solution then fully apply and hold the
brakes. A 25 mm (1 in) bubble in five seconds is
permissible.
Preventive Maintenance
Every 300 hours, 16,000 km (10,000 mi) or three months:
• Check that the air lines and valve mounting are secure.
Check the air lines for chafing, kinking or corrosion and
replace as necessary. Check for a clean exhaust port.
Every 7200 hours, 160,000 km (100,000 mi), or every two
years:
• Remove the valve and replace the spring and all rubber
parts.
Published 01-29-2015, Control # 512-01
UNDERCARRIAGE
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