Dover HEIL LIBERTY TP1L-SM-0520, Service Manual

Page: 54 / 136

Issued May 2020
Lift Arm Copyright 2020, Heil Environmental
Printed in the U.S.A.
Lift Arm
48
CHECK LIFT AND TORQUE MOUNT BASE BOLTS
When the Lift Base Mounting bolts weld is cracked, you must replace the bolts and nuts. The goal of this torque method is
to achieve a 59,000lb clamp load consistently. A torque multiplier is not accurate enough at the values required. This
method (torque/turn) is accurate and repeatable.
This method is required for field installation where proper torquing equipment may not be available. It also allows proper
bolt torquing using standard wrenches and “cheater” bars.
A. Tools Required
Figure 12. Lift Mount Base
Quantity Tool
1 Torque wrench (1” and 5/8” sockets)
1 Combination wrench (1” and 5/8”)
1 Welding equipment
1 Personal protective equipment
B. Parts Required
See Parts Manual for replacement parts.
C.Before Replacing Lift Mount Bolts
1. Visually inspect the lift mount bolts on both the street side and
curb side. See the illustration for locations.
2. Make sure the bolts are secure and there is no movement.
3. Make sure welded bolts do not have cracks.
4. If any lift mount bolt is loose, cracked or broken, replace all
bolts. Use only the parts specified. Lower grade parts are not
acceptable.
5. After torquing, bolts and nuts cannot be reused. To install and
torque bolts, complete section D below.
D.Replace Lift Mount Bolts
1. Make sure the threads on both the bolt and nut are dry (no
lubrication) before installation.
2. Install bolt into lift base and lift mount brackets.
3. Thread nuts onto bolts and hand tighten.
4. Use a torque wrench with a combination wrench to tighten the nut to 100 ft-lbs., holding bolt-head and turning nut.
5. Mark nut, washer and lift base with a paint market at a corner.
6. Count around 3-1/2 nut flats and mark the center of the nut, washer and lift base.