Calibration Specification; Bolt Grade Identification; Bolt Grade Markings Chart - Precor StairClimbers Experience 800 line Series Service Manual

System Component
Flathead screws
Intermediate Assy Shaft Nylok blue-patch bolt

Calibration Specification

System calibration specification:
System Component
Drive Belt Adjustment
Drive Chain Adjustment
Step Chain Tension
Notes: * Sonic belt tension frequency (Hz)

Bolt Grade Identification

Bolt grade markings are used to categorize bolts according to the bolt material, man-
ufacturing process, and mechanical properties. The grade of the bolt is stamped on the
head of the bolt.
US SAE bolts: The bolt grade markings are determined by the number of the lines stamped
on the head of the bolt. The number of lines is always two less than the grade of the bolt.
Count the lines, add two, and you can determine the grade of the bolt.
Metric bolts: On metric bolts, the bolt grade is identified by a bolt grade number stamped
on the head of the bolt.
CAUTION: Always replace bolts with the same grade bolt. If you don't know the
grade of the replacement bolt –

Bolt Grade Markings Chart

Example bolt grades used on Precor equipment (may not represent all bolt grades). Always
match the replacement bolt grade marking to the removed bolt grade marking.
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
25 in-lbs (2.8 Nm)
180 in-lbs (15 ft-lbs, 20.3 Nm).
Specification
Belt Tension: 124 Hz +/- 10 Hz*
Tension Gap: 3/8" (10 mm)
Pinch Point Distance: Min 1" (2.5 cm
The rear step shaft chain link is within the top half of
the step chain tension adjustment slot.
.
DO NOT USE THE
2 General Information
Bolt Grade Identification
Specification
BOLT.
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