1-23
SPEC
Specification
PTT unit
Optional equipment
General tightening torque
This chart indicates the tightening torques for
standard fasteners with a standard ISO
thread pitch. Tightening torque specifications
for special components and assemblies are
provided in the applicable sections of this
manual. To prevent warpage, tighten multi-
fastener assemblies in a crisscross fashion
and progressive stages until the specified
torque is reached. Unless otherwise indi-
cated, torque specifications require clean, dry
threads.
Components should be at room temperature.
Part to be tightened Screw size
Tightening torques
N·mkgf·mft·lb
Stator screw M4 2 0.2 1.5
Brush holder screw M3 1 0.1 0.7
PTT motor assembly bolt M6 7 0.7 5.2
Reservoir cap — 70.75.2
Manual valve — 30.32.2
Gear pump bolt M4 4 0.4 3.0
Valve lock screw — 60.64.4
Gear pump housing bolt M6 9 0.9 6.6
Main valve — 11 1.1 8.1
Tilt piston bolt M10 61 6.1 45.0
Tilt cylinder end screw — 90 9.0 66.4
Part to be tightened Screw size
Tightening torques
N·mkgf·mft·lb
Self-locking nut (6X4) — 37 3.7 27.3
Width
across
flats (A)
Screw
size (B)
General torque
specifications
N·mkgf·mft·lb
8 mm M5 5 0.5 3.7
10 mm M6 8 0.8 5.9
12 mm M8 18 1.8 13.3
14 mm M10 36 3.6 26.6
17 mm M12 43 4.3 31.7
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