Toro 4100-D service manual 18 to 22 ft Lb 25 to 29 N

Hydraulic Hose and Tube Installation (O-Ring Face Seal Fitting)

1.Make sure threads and sealing surfaces of the hose/ tube and the fitting are free of burrs, nicks, scratches or any foreign material.

2.As a preventative measure against leakage, it is rec- ommended that the face seal O--ring be replaced any time the connection is opened. Make sure the O--ring is installed and properly seated in the fitting groove. Lightly lubricate the O--ring with clean hydraulic oil.

3.Place the hose/tube against the fitting body so that the flat face of the hose/tube sleeve fully contacts the O-- ring in the fitting.

4.Thread the swivel nut onto the fitting by hand. While holding the hose/tube with a wrench, use a torque wrench to tighten the swivel nut to the recommended installation torque shown in Figure 5. This tightening process will require the use of an offset wrench (e.g. crowfoot wrench). Use of an offset 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 lower than the listed installation torque (see Using a Torque Wrench with an Offset Wrench in the Torque Specifica- tions section of Chapter 2 -- Product Records and Main- tenance).

5.If a torque wrench is not available or if space at the swivel nut prevents use of a torque wrench, an alternate method of assembly is the Flats From Wrench Resist- ance (F.F.W.R.) method (Fig. 2).

A.Using a wrench, tighten the swivel nut onto the fit- ting until light wrench resistance is reached (approxi- mately 30 in--lb).

B.Mark the swivel nut and fitting body. Hold the hose/tube with a wrench to prevent it from turning.

C.Use a second wrench to tighten the nut to the cor- rect Flats From Wrench Resistance (F.F.W.R.). The markings on the nut and fitting body will verify that the connection has been properly tightened.

Size			F.F.W.R.
4	(1/4 in. nominal hose or tubing)		1/2 to 3/4
6	(3/8 in.)		1/2 to 3/4
8	(1/2 in.)		1/2 to 3/4
10		(5/8 in.)	1/2 to 3/4
12		(3/4 in.)	1/3 to 1/2
16		(1 in.)	1/3 to 1/2
		Swivel Nut	Fitting Body
		O-ring

Tube or Hose

Figure 3

Mark Nut		Final
and Fitting	Position
Body
			Initial
Extend Line			Position
AT WRENCH RESISTANCE			AFTER TIGHTENING

Figure 4

Hydraulic System

Fitting Dash Size	Hose/Tube Side Thread Size		Installation Torque
4	9/16 --	18	18 to 22 ft	--lb (25 to 29 N--	m)
6	11/16 --	16	27 to 33 ft	--lb (37 to 44 N--	m)
8	13/16 --	16	37 to 47 ft	--lb (51 to 63 N--	m)
10	1 -- 14		60 to 74 ft--	lb (82 to 100 N--	m)
12	1 3/16 --	12	85 to 105 ft--	lb (116 to 142 N--		m)
16	1 7/16 --	12	110 to 136 ft--	lb (150 to 184 N--		m)
20	1 11/16 --	12	140 to 172 ft	--lb (190 to 233 N--		m)
		Figure 5
Groundsmaster 4100 D--		Page 4 -- 5		Hydraulic System