Straight Thread Types, Port Connections; Flange Connection Types; Tightening Methods - JLG E450A Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULIC INFORMATION & SCHEMATICS

Straight Thread Types, Port Connections

ORB = o-ring boss per SAE J1926, ISO 11926
MPP = metric pipe parallel o-ring boss per SAE J2244, ISO
6149, DIN 3852
Figure 5-8. ORB-MPP Thread
MFF = metric flat face port per ISO 9974-1
BSPP = British standard parallel pipe per ISO 1179-1,
DIN 3852-2
Figure 5-9. MFF-BSPP Thread
5-4

Flange Connection Types

FL61 = code 61 flange per SAE J518, ISO 6162
FL62 = code 62 flange per SAE J518, ISO 6162
Figure 5-10. FL61-FL62

Tightening Methods

Torque = Application of a twisting force to the applicable con-
nection by use of a precise measurement instrument (i.e.
torque wrench).
Finger Tight = The point where the connector will no longer
thread onto the mating part when tightened by hand or fin-
gers. Finger Tight is relative to user strength and will have
some variance. The average torque applied by this method is
3 ft-lbs [4 N-m]. Also referred to as 'Hand Tight. '
TFFT = Turns From Finger Tight; Application of a preload to a
connection by first tightening the connection by hand (fin-
gers) and applying an additional rotation counted by a
defined number of turns by use of a tool.
FFWR = Flats from Wrench Resistance; Application of a preload
to a connection by tightening to the point of initial wrench
resistance and turning the nut a described number of 'flats' . A
'flat' is one side of the hexagonal tube nut and equates to 1/6
of a turn. Also referred to as the 'Flats Method' .
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