Hyster D174, Руководство по обслуживанию и ремонту

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1900 SRM 97 Pump Output Check
1. HYDRAULIC PUMP
2. INLET PORT
3. OUTLET PORT
4. HYDRAULIC TANK
5. PRESSURE GAUGE
6. TEE FITTING
7. FLOW METER
8. NEEDLE VALVE
Figure 11. Hydraulic Pump Output Check with Flow Meter
METHOD NO. 2
WARNING
Hydraulic oil can be hot. Do not touch the oil
during the tests.
1. Another method of checking the pump output is
to measure the amount of oil moved in a given
amount of time. See Figure 12. Run engine until
oil is 55 to 65 C (131 to 149
F) . Disconnect line
from outlet port of pump. Install a 0 to 20 MPa
(0 to 3000 psi) pressure gauge on a tee fitting
connected to a hose from the outlet port. Install
needle valve on end of hose. Connect another
hose to needle valve. Put the other end of the
hose in a container with a 18 liter (5 gal) capacity.
Make sure reservoir is full.
CAUTION
This test must be done quickly to prevent the
hydraulic tank from becoming empty. Do not
operate the engine when there is no oil in the
hydraulic tank.
2. The needle valve must be fully open. Start en-
gine and run engine at its governed rpm for 5 sec-
onds. Stop engine. Measure volume of oil that
entered container in 5 seconds. Multiply quan-
tity in container by 12 to find output per minute.
Compare pump output rate with the specifica-
tions found in the Capacities and Specifica-
tions section of the Service Manual for your lift
truck. The pump output rate must be within 20%
of the specifications.
3. Start engine and run engine at its governed rpm.
Close needle valve until pressure increases to
just below relief valve setting. Measure the vol-
ume of fluid the pump moves in 5 seconds. Com-
pare this quantity with the results from the test
of the pump output at low pressure. The output
of the pump at high pressure must be within 25%
of the volume of oil flow at low pressure.
11