New Holland LS160 Manual page 201

The following pump ports control direction of
motor (tire) rotation forward or reverse.
Front pump controls right motor:
1 - Forward (bottom)
2 - Reverse (top)
Rear pump controls left motor:
3 - Forward (bottom)
4 - Reverse (top)
IMPORTANT: Check and make sure the flowmeter is
connected properly, so when the pump is stroked the
flow from the pump goes to the inlet side of the
flowmeter.
IMPORTANT: Check the hydraulic oil level and add
if required to insure sufficient oil for the test.
9. Using the EIC or a photo tach, set the engine
speed to 2900 RPM.
10. With the flowmeter regulator valve completely
opened, 1, stroke the control lever for the
direction to be tested and take a free flow reading
and record. The pump free flow is at "0" pressure.
CAUTION
Always stay clear of moving parts during testing
or serious injury could occur.
11. Turn the pressure regulator valve, 1, in on the
flowmeter until a pressure reading of 136 bar
(2000 PSI) is obtained and record.
12. Pump efficiency specifications:
When figuring the pump efficiency it should not
be less than 80%. The pump free flow should not
be less than 81 LPM (21.2 GPM).
a. Pump flow recorded at 136 bar (2000 PSI)
divided by the free flow reading at zero pressure
will determine the pump efficiency.
EXAMPLE:
Pump free flow - 23.5
Pump flow at 2000 PSI - 22.4
Pump efficiency:
SECTION 29 - HYDROSTATIC TRANSMISSION
22.4
= 0.95 or 95%
23.5
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