User Manual

SERVICE RECOMMENDATIONS FOR O-RING

BOSS FITTINGS

STRAIGHT FITTING

1. Inspect O-ring boss seat for dirt or defects.

2. Lubricate O-ring with petroleum jelly. Place electrical

tape over threads to protect O-ring. Slide O-ring over

tape and into O-ring groove of fitting. Remove tape.

3. Tighten fitting to torque value shown on chart.

ANGLE FITTING

1. Back-off lock nut (A) and back-up washer (B)

completely to head-end (C) of fitting.

2. Turn fitting into threaded boss until back-up washer

contacts face of boss.

3. Turn fitting head-end counterclockwise to proper index

(maximum of one turn).

4. Hold fitting head-end with a wrench and tighten

locknut and back-up washer to proper torque value.

NOTE: Do not allow hoses to twist when tightening

fittings.

TORQUE VALUE

Thread Size N·m lb-ft

3/8-24 UNF . . . . . . . . . . . . . . . . 8 . . . . . . . . . . . . . . 6

7/16-20 UNF . . . . . . . . . . . . . . . 12 . . . . . . . . . . . . . . 9

1/2-20 UNF . . . . . . . . . . . . . . . 16 . . . . . . . . . . . . . 12

9/16-18 UNF . . . . . . . . . . . . . . . 24 . . . . . . . . . . . . . 18

3/4-16 UNF . . . . . . . . . . . . . . . 46 . . . . . . . . . . . . . 34

7/8-14 UNF . . . . . . . . . . . . . . . 62 . . . . . . . . . . . . . 46

1-1/16-12 UN . . . . . . . . . . . . . . . 102 . . . . . . . . . . . . . 75

1-3/16-12 UN . . . . . . . . . . . . . . . 122 . . . . . . . . . . . . . 90

1-5/16-12 UN . . . . . . . . . . . . . . . 142 . . . . . . . . . . . . 105

1-5/8-12 UN . . . . . . . . . . . . . . . 190 . . . . . . . . . . . . 140

1-7/8-12 UN . . . . . . . . . . . . . . . 217 . . . . . . . . . . . . 160

NOTE: Torque tolerance is ± 10%.

T6243AE -UN-18OCT88T6520AB -UN-18OCT88

04T,90,K66 -19-01AUG94

Repair Specifications/Service Recommendations

TM1590 (17MAY95) 10-15-7 316, 318 & 420 Lawn and Garden Tractors

020895