Displacement limiter
H1 pumps are designed with optional mechanical displacement (stroke) limiters factory set to max.
displacement. The maximum displacement of the pump can be set independently for forward and
reverse using the two adjustment screws to mechanically limit the travel of the servo piston down to 50
% displacement.
Adjustments under operating conditions may cause leakage. The adjustment screw can be completely
removed from the threaded bore if backed out to far.
Displacement change (approximately) H1P 069/078
Parameter Size 069/078
1 Turn of displacement limiter screw
7.4 cm
3
[0.45 in
3
]
Internal wrench size
4 mm
External wrench size
13 mm
Torque for external hex seal lock nut
24 N•m [212 lbf•in]
For more information, see H1 Axial Piston Pumps, Service Manual 520L0848, the section “Displacement
Limiter Adjustment”.
Technical Information
H1 Axial Piston Single Pumps, Size 069/078
Control options
38 11062169 • Rev 0700 • November 2015
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