Oshkosh JLG 1500SJ, Service And Maintenance Manual

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SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
5-4 – JLG Lift – 3121262
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
MFF = metric flat face port per ISO 9974-1
BSPP = British standard parallel pipe per ISO 1179-1, DIN 3852-
2
Flange Connection Types
FL61 = code 61 flange per SAE J518, ISO 6162
FL62 = code 62 flange per SAE J518, ISO 6162
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 pre-
load 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.’
Figure 5-8. ORB-MPP Thread
Figure 5-9. MFF-BSPP Thread
Figure 5-10. ORB-MPP Thread