National Crane 01-22-2019 Control # 051-08 2-19
1300A HYDRAULIC SYSTEM
OIL COOLER SERVICE & MAINTENANCE
The heat exchanger must be kept clean to allow for efficient
operation of the cooler system. Frequent washing of the heat
exchanger core will eliminate oil film, road dirt and other
foreign object buildup on the heat exchanger fins which
reduces cooling efficiency.
Frequent inspection and tightening of hose clamp line
connections will eliminate the possibility of end connection
failure due to back pressure from cold startup.
If cooler system fails to provide adequate performance,
reduced air or oil flow through the heat exchanger is the
probable cause. The cooling fan should be inspected for
proper operation. Any obstructions to air flow should be
corrected (cooler too close to other truck components,
foreign matter in heat exchanger fins, etc.). All hydraulic lines
should be periodically checked for obstructions, hose kinks
or other flow restrictions.
O-RING FACE SEAL
O-RING BOSS
B
A
O-RING
FACE (REF)
O-RING
BOSS (REF)
A
B
O-RING FACE SEAL FITTING SIZE O-RING BOSS
THREAD
SIZE
B inches
(mm)
A inches
(mm)
TUBE
O. D.
MFGR
’S
SIZE
CODE
A inches
(mm)
B inches
(mm)
THREAD
SIZE
9/16-18 .07 (1.78) .301 (7.64) .250 4 .351 (8.92) .072 (1.83) 7/16-20
11/16-16 .07 (1.78) .364 (9.24) .375 6 .458 (11.63) .078 (1.98) 9/16-18
13/16-16 .07 (1.78) .489(12.42) .500 8 .644 (16.36) .087 (2.21) 3/4-16
1-14 .07 (1.78) .614 (15.60) .625 10 .755 (19.18) .097 (2.46) 7/8-14
1 3/16-12 .07 (1.78) .739 (18.77) .750 12 .924 (23.47) .116 (2.95) 1 1/16-12
1 7/16-12 .07 (1.78) .926 (23.52) 1.000 16
1.171
(29.74)
.116 (2.95) 1 5/16-12
1 11/16-
12
.07 (1.78)
1.176
(29.87)
1.250 20
1.475
(37.46)
.118 (3.00) 1 5/8-12
2-12 .07 (1.78)
1.489
(37.82)
1.500 24
1.720
(43.69)
.118 (3.00) 1 7/8-12
NOTE:
Contact your National Crane Distributor or Manitowoc Crane Care for O-Ring boss seal kits.
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