Manitowoc National Crane NBT40 Series Service Manual

6
National Crane Published 8-01-2017 Control # 287-11 6-15
NBT40 SERVICE MANUAL SWING
Pressing the pedal down allows the lock to engage the turret
bearing ring teeth; releasing the pedal disengages the lock from
the bearing ring teeth.
Removal
1. Release the swing lock foot pedal and be sure the lock is
disengaged from the turret bearing ring (15,
Figure 6-12).
2. Remove the clevis pin (1, Figure 6-12), cotter pin (2) and
washer (3) securing the cable (4) to the swing lock (5).
3. Remove shim (6, Figure 6-12) and attaching hardware
screws (7) and lockwashers (8).
4. Remove four screws (9, Figure 6-12), bushings (10) and
flatwashers (11) and move swing lock (5) from the turret.
5. Remove two springs (12) from the swing lock. Inspection
the springs for wear or damage, replace springs as
needed.
Inspect the swing lock assembly for wear or damage;
replace parts as needed.
Installation
1. Position the swing lock (5, Figure 6-12) onto the turret
and secure with four screws (9, Figure 6-12). bushings
(10) and flatwashers (11).
2. Place shim (6, Figure 6-12) on top of swing lock
mounting block and secure with screws (7) and
lockwashers (8)
Use shim to eliminate all side to side movement
between the swing lock (5, Figure 6-12) and the swing
lock mounting blocks welded to the turret.
3. Attach the cable (4, Figure 6-12) to the swing lock (5)
with clevis pin (1), cotter pin (2) and washer (3).
4. Adjust the cable (4, Figure 6-12) using the following
instructions.
a. Engage swing lock assembly with turret bearing ring
so that maximum tooth engagement is achieved.
b. View A, Figure 6-12 shows a side view of the swing
lock engaged with the turret bearing gear teeth (15).
When the swing lock is disengaged the clearance
between turret bearing teeth (15) and the swing lock
is . 57 in (14.5 mm). This will allow the turret bearing
ring to rotate freely and provide maximum
engagement when the swing lock is applied.
c. Adjust stop bolt (13, Figure 6-12) until the head of
the bolt comes in contact with the link on swing
assembly. Tighten hex nut (14).
d. Adjust the cable so that the cable pulls the link
rightly against the stop bolt (13) when the foot pedal
control is fully engaged.
e. Attach the springs (12) and operate the foot pedal
control lever several times to verify that the lock
engages and disengages from the bearing ring gear
(15) properly. Adjust the cable as required.
5. Tighten the swing lock screws (9, Figure 6-12); refer to
“Fasteners And Torque Values” on page 7 for the torque
value for the screws.
Reference Only

Manitowoc National Crane NBT40 Series Specifications

General

Brand	Manitowoc
Model	National Crane NBT40 Series
Category	Construction Equipment
Language	English