PREVOST X3-45 COMMUTER User Manual

SECTION 00 : GENERAL INFORMATION
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual First release Oct 2020
13
4.3 SELF-LOCKING FASTENERS
A self-locking fastener is designed with an
interference fit between the nut and bolt threads.
This is most often accomplished by distortion of
the top thread of an all-metal nut or bolt or by
using a nylon patch on the threads. A nylon
insert or the use of adhesives may also be used
as a method of interference between nut and
bolt threads (Figure 13).
FIGURE 13: SELF-LOCKING FASTENERS 00004
4.4 RECOMMENDATIONS FOR REUSE
Clean, rust-free self-locking fasteners may be
reused as follows:
a) Clean dirt and other foreign matter from
the fastener;
b) Inspect the fastener to ensure there is no
crack, elongation, or other sign of fatigue
or over tightening. If there is any doubt,
replace with a new self-locking fastener of
equal or greater strength;
c) Assemble parts and hand start fastener;
d) Observe that, before the fastener seats, it
develops torque per the chart in the
following table. If there is any doubt,
replace with a new self-locking fastener of
equal or greater strength;
e) Tighten the fastener to the torque specified
in the applicable section of this manual;
Fasteners which are rusty or damaged should be
replaced with new ones of equal or greater
strength
.
SELF-LOCKING TORQUE CHART BEFORE FASTENER SEATS
METRIC
6 & 6.3 8 10 12 14 16 20
NUTS AND Nm 0.4 0.8 1.4 2.2 3.0 4.2 7.0
ALL-METAL BOLTS lb-in 4.0 7.0 12 18 25 35 57
ADHESIVE OR NYLON Nm 0.4 0.6 1.2 1.6 2.4 3.4 5.6
COATED BOLTS lb-in 4.0 5.0 10 14 20 28 46
US STANDARD
¼ 5/16 3/8 7/16 ½ 9/16 5/8 ¾
NUTS AND Nm 0.4 0.6 1.4 1.8 2.4 3.2 4.2 6.2
ALL-METAL BOLTS lb-in 4.0 5.0 12 15 20 27 35 51
ADHESIVE OR NYLON Nm 0.4 0.6 1.0 1.4 1.8 2.6 3.4 5.2
COATED BOLTS lb-in 4.0 5.0 9.0 12 15 22 28 43

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in