
214
Maintenance and Lubrication Section (Pipelayer Attachment Kit) WEBM1000
Boom Stop Valve Operation and Adjustment
Table 33
Ambient air temperature
[°C (°F)]
Accumulator precharge
pressure [kPa (psi)± 70
kPa (10 psi)
-7°C (20°F) 3100 kPa (450 psi)
-1°C (30°F) 3170 kPa (460 psi)
4°C (40°F) 3240 kPa( 470 psi)
10°C (50°F) 3310 kPa (480 psi)
16°C (60°F) 3375 kPa (490 psi)
21°C (70°F) 3445 kPa (500 psi)
27°C (80°F) 3515 kPa (510 psi)
32°C (90°F) 3580 kPa (520 psi)
38°C (100°F) 3650 kPa (530 psi)
43°C (110°F) 3720 kPa (540 psi)
49°C (120°F) 3790 kPa (550 psi)
Boom Stop Valve Operation
and Adjustment
The Boom Stop system stops the boom winch
from hauling-in when the boom is vertical,
preventing overloading of key machine
components. Incorrectly adjusting, or defeating
the boom stop valve could result in serious
equipment damage, personal injury, or even
death. Its operation must be check and verified
daily.
284
Illustration 284
Boom stop valve located behind access cover in Left Hand tower.
• To check the operation, boom in slowly taking care
not to over tension the boom lines when the boom
goes vertical. When the boom is vertical, the boom
winch should stop. No increase in tension should
occur once the boom comes into contact with the
left hand tower. If the boom winch does not stop
and continues to increase the cable tension, STOP
the operation at once and lower the boom to
release the tension. Adjust the boom stop valve as
set out below.
• Raise the boom vertical so that it is JUST in
co
ntact with
the tower; the boom kick-out rod is
fully retracted into the tower. Do not over tighten
the lines to the point that the boom or structures
are overly stressed.
• Remove the boom stop valve access panel from
t
he tower
.
• Loosen the boom stop valve nuts.
• Move the valve so that it just contacts the boom
kick-out ro
d.
• Move the valve an additional 10 mm (3/8-in)
towards the boom so
that the valve's piston is fully
depressed.
• Tighten the valve in position with the valve nuts.
• Test the boom stop valve to see that it works
pr
operly
. Lower the boom until the boom stop
valve piston is free from the kick-out rod.
• Replace the boom stop valve access panel from
t
he tower
.
• Boom in slowly taking care not to over tension the
boom lines whe
n the boom goes vertical. When
the boom is vertical, the kick-out rod will move the
boom stop valve piston in 9.5 mm (3/8 in), and the
boom winch should stop with the boom vertical.
No increase in tension should occur once the
boom comes into contact with the left hand tower,
readjust the boom stop valve as required.
Boom Line – Install
Do not operate or work on this equipment unless
you have read and understand the instructions
and warnings in the Operation and Maintenance
Manual. Failure to follow the instructions or heed
the warnings could result in injury or death.
Contact your dealer or Vanguard Equipment or
visit our website at vanguardequip.com for
replacement manuals. Proper care is your
responsibility.
Personal injury or death can result from worn
wire rope cable. Worn or frayed cable could break
causing injury. Check the wire rope cable. If cable
is worn or is frayed install new cable. Wear
gloves when handling the wire rope cable. Proper
care is your responsibility.