Loader Bobcat 853, 853H. Instruction - page 83

A

P–13008

Nut Seals
to Fitting

Nut Seals
to Port

Secondary O–ring Seal

Fitting

TORQUE

Nut

Ft.–lbs.

Wrench Size

Thread Size

(Nm)

11/16’’

9/16’’ – 18

22 (30)

15/16’’

3/4’’ – 16

40 (54)

1–1/8’’

7/8’’ – 14

60 (81)

1–1/4’’

1–1/16’’ – 12

84 (114)

1–1/2’’

1–5/16’’ – 12

118 (160)

Port Seal and O–ring Boss
Tightening Torque

2

1

B

P–13571

853, 853H Loader

–9–15–

Service Manual

HYDRAULIC CONNECTION SPECIFICATIONS (CONT’D)
Port Seal Fitting

The nut is the primary seal, the O–ring is the secondary
seal and helps absorb vibration and pressure pulses at the
connection [A].

The hex portion of the nut does not contact the surface of
the component when the nut is tight.

Use the following procedure to tighten the port seal fitting:

Port seal and nut, washer and O–ring (O–ring Boss) fittings
use the same tightening torque valve chart.

If a torque wrench cannot be used, use the following
method.

Tighten the nut until it just makes metal to metal contact,
you can feel the resistance.

Tighten the nut with a wrench no more than one hex flat
maximum.

Do not over tighten the port seal fitting.

NOTE: If a torque wrench cannot be used, use the hex

flat tightening method as an approximate
guideline.

NOTE: Port seal fittings are not recommended in all

applications. Use O–ring boss fittings in these
applications.

Do not use port seal fittings when a thread in orifice (Item
1) [B] is used in the port. The orifice may interfere with the
fitting and prevent it from sealing.

Use an O–ring boss fitting (Item 2) [B] as shown.

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