Farr HD8625 - Page 53

Technical Manual
hD8625 8-
5
/
8
” 35K Tong
3.11
MainTenance
ALL FASTENERS USED DURING REASSEMBLY OF LOAD-BEARING COMPONENTS (CHAIN
SLINGS, RIGID SLINGS, BACKUP LEGS) MUST BE TIGHTENED TO THE CORRECT TORQUE.
THREADED FASTENERS USED IN LOAD-BEARING DEVICES MUST BE SECURED WITH RED LOC-
TITE™.
I. ASSEMBLY PROCEDURES
AssemblyofFarrHydraulicPowerTongsissimple,andcanbeaccomplishedwithouttheuseofspecialtools.Theinstructionsonthis
pagearepresentedasaguideonly,andaresimilartotheassemblysequenceourtechnicianwouldusewhileassemblingthetongin
ourplant.
NOTE ON INSTALLATION PRACTICES: Ensure all bearings are liberally greased before installing over a shaft or into gears or
bearing caps. When inserting a shaft through a support roller assembly ensure shaft is greased. Also ensure all metal-to-metal
contact in the gear train is adequately greased. When graphics are not used in the assembly process, please refer to the relevant
exploded diagrams in Section 5.
TIGHTENING TORQUE GUIDE
SAE GRADE 8 - FINE THREAD
SIZE CLAMP LOAD PLAIN PLATED
1/4-28(.250) 3,263 14ft.lbs. 10ft.lbs.
5/16-24(.3125) 5,113 27ft.lbs. 20ft.lbs.
3/8-24(.375) 7,875 49ft.lbs. 37ft.lbs.
7/16-20(.4375) 10,650 78ft.lbs. 58ft.lbs.
1/2-20(.500) 14,400 120ft.lbs. 90ft.lbs.
9/16-18(.5625) 18,300 172ft.lbs. 129ft.lbs.
5/8”-18(.625) 23,025 240ft.lbs. 180ft.lbs.
3/4-16(.750) 33,600 420ft.lbs. 315ft.lbs.
7/8”-14(.875) 45,825 668ft.lbs. 501ft.lbs.
1-12(1.000) 59,700 995ft.lbs. 746ft.lbs.
1-14(1.000) 61,125 1019ft.lbs. 764ft.lbs.
11/8-12(1.125) 77,025 1444ft.lbs. 1083ft.lbs.
11/4-12(1.125) 96,600 2012ft.lbs. 1509ft.lbs.
13/8-12(1.375) 118,350 2712ft.lbs. 2034ft.lbs.
11/2-12(1.500) 142,275 3557ft.lbs. 2668ft.lbs.
SAE GRADE 8 - COARSE THREAD
SIZE
CLAMPLOAD PLAIN PLATED
1/4-20(.250) 2,850 12ft.lbs. 9ft.lbs.
5/16-18(.3125) 4,725 25ft.lbs. 18ft.lbs.
3/8-16(.375) 6,975 44ft.lbs. 33ft.lbs.
7/16-14(.4375) 9,600 70ft.lbs. 52ft.lbs.
1/2-13(.500) 12,750 106ft.lbs. 80ft.lbs.
9/16-12(.5625) 16,350 153ft.lbs. 115ft.lbs.
5/8”-11(.625) 20,325 212ft.lbs. 159ft.lbs.
3/4-10(.750) 30,075 376ft.lbs. 282ft.lbs.
7/8”-9(.875) 41,550 606ft.lbs. 454ft.lbs.
1-8(1.000) 54,525 909ft.lbs. 682ft.lbs.
11/8-7(1.125) 68,700 1288ft.lbs. 966ft.lbs.
11/4-7(1.125) 87,225 1817ft.lbs. 1363ft.lbs.
13/8-6(1.375) 103,950 2382ft.lbs. 1787ft.lbs.
11/2-6(1.500) 126,450 3161ft.lbs. 2371ft.lbs.
REPLACEMENT FASTENER (BOLTS, NUTS, CAP SCREWS, MACHINE SCREWS, ETC.) USED
DURING MAINTENANCE OR OVERHAUL MUST BE GRADE 8 OR EQUIVALENT UNLESS OTHER-
WISE SPECIFIED.