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Groundsmaster 4500--D/4700--DHydraulic System Page 4 -- 8
Hydraulic Fitting Installation (SAE Straight Thread O--Ring Fitting into Component Port)
Non--Adjustable Fitting (Fig. 6)
1. Make sure all threads and sealing surfaces of fitting
and component port are free of burrs, nicks, scratches
or any foreign material.
2. As a preventative measure against leakage, it is rec-
ommended that the O--ring be replaced any time the
connection is opened.
3. Lightly lubricate the O--ring with clean hydraulic oil.
Fitting threads should be clean with no lubricant applied.
IMPORTANT: Before installing fitting into port, de-
termine port material. If fitting is to be installed into
an aluminum port, installation torque is reduced.
4. Install the fitting into the port. Then, use a torque
wrench and socket t o tighten the fitting to the recom-
mended installation torque shown in Figure 7.
NOTE: Use of an offset wrench (e.g. crowfoot wrench)
will affect torque wrench calibration due to the effective
length change of the torque wrench. Tightening torque
when using a torque wrench with an offset wrench will
be less than the recommended installation torque. See
UsingaTorqueWrenchwithanOffsetWrenchinthe
Torque Specifications section of Chapter 2 -- Product
Records and Maintenance to determine necessary con-
version information.
5. If a torque wrench is not available, or if space at the
port prevents use of a torque wrench, an alternate meth-
od of assembly is the Flats From Finger Tight (F.F.F.T.)
method.
A. Install the fitting into the port and tighten it down
full length until finger tight.
B. If port material is steel, tighten the fitting to the
listed F.F.F.T. If port material is aluminum, tighten f it-
ting to 60% of listed F.F.F.T.
Size F.F.F.T.
4 (1/4 in. nominal hose or tubing) 1.00 +
0.25
6 (3/8 in.) 1.50 +
0.25
8 (1/2 in.) 1.50 +
0.25
10 (5/8 in.) 1.50 +
0.25
12 (3/4 in.) 1.50 +
0.25
16 (1 in.) 1.50 +
0.25
Figure 6
O--ring
Fitting
Fitting
Dash Size
Fitting Port Side
Thread Size
Installation Torque Into
Steel Port
Installation Torque Into
Aluminum Port
4 7/16 -- 20 15to19ft--lb(21to25N--m) 9to11ft--lb(13to15N--m)
5 1/2 -- 20 18to22ft--lb(25to29N--m) 11 to 15 ft--lb (15 to 2 0 N--m)
6 9/16 -- 18 34to42ft--lb(47to56N--m) 20to26ft--lb(28to35N--m)
8 3/4 -- 16 58to72ft--lb(79to97N--m) 35to43ft--lb(48to58N--m)
10 7/8 -- 14 99to121ft--lb(135to164N--m) 60 to 74 ft--lb (82 to 100 N--m)
12 11/16--12 134to164ft--lb(182to222N--m) 81 to 99 ft--lb (110 to 134 N--m)
14 13/16--12 160to196ft--lb(217to265N--m) 96to118ft--lb(131to160N--m)
16 15/16--12 202to248ft--lb(274to336N--m) 121to149ft--lb(165to202N--m)
20 15/8--12 247to303ft--lb(335to410N--m) 149to183ft--lb(202to248N--m)
Figure 7