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Service Recommendations for Hydraulic Fittings
Two hydraulic fitting designs are used on this machine.
Flat Face O-ring Seal Fitting (ORS Fitting)
O-ring (1) is used on the sealing surfaces of adapter (2) to
prevent oil leakage.
Precautions for Use
1. Replace O-ring (1) with a new one when assembling
fittings.
2. Check that O-ring (1) is properly fitted in O-ring groove
(3). Tighten union (4).
Tightening union (4) with O-ring (1) out of the groove
may damage O-ring (1) and cause oil leak.
3. When assembling fittings, take care not to make a dent
on O-ring groove (3) of adaptor (2) and sealing surface
(6) on hose (5) or valve side. Failure to do so may result in
damage to O-ring (1) leading to oil leak.
4. If oil leaks from a loose connection of union (4), do not
tighten fitting (2). Open the connection, replace O-ring
(1) with a new one and check for correct O-ring position
before tightening the connection.
Tightening Torque:
Tighten fittings to the torque values shown below.
Wrench size (mm)
N·m
Tightening
(kgf∙m)
Torque:
(lbf·ft)
MAINTENANCE
19
22
24
30
70
80
(3.0)
(7.0)
(8.0)
(22)
(52)
(59)
2
±10 %
27
36
41
95
180
210
(9.5)
(18)
(21)
(70)
(130)
(152)
7-48
1
4
3
6
5
M104-07-033
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