Test - Yale A7S1 Service Manual

8000 YRM 2199
12. Mount spring washer (item 13) and bolt (item 12),
and torque to 47 N•m (34.67 lbf).
13. Inspect the gear pump to confirm it is assembled
completely. Place the driving shaft into the vice
stand, then turn pump and confirm it rotates
easily.
Before this pump is reinstalled, check a second
time to confirm it is assembled completely and the
rotating direction is correct.
a. Check if the lower part is damaged or dirty.
b. Check if the flange surface is damaged or dirty.
c. Mount O-ring, after following the previous
steps.

Test

Test the pump after assembly. Confirm the pump has
reached the specified performance after reassembly.
Perform a test run after pump is installed into forklift
truck. If pump is blocked or internal parts are
excessively worn out, fluid must be replaced and filter
must be replaced or cleaned.
1. Install pressure gauge on high-pressure line near
the pump.
2. Place the transmission in the NEUTRAL position,
for pump to run at a speed of 500-1000rpm. While
in the in the NEUTRAL position, the pressure
gauge should read slightly lower than
1 MPa (145.04 psi). Keep pump running for 10
minutes.
3. Increase rotating speed to 1500-2000rpm, and
allow to idle for 10 minutes.
4. Keep the rotating speed at 1500-2000rpm,
increase the pressure to
2-3 MPa (290.08-435.11 psi) for 5 minutes.
Repeat until maximum pressure is reached. Use
overflow valve to increase the load to adjust
pressure. Allow each fluid circuit to work for 5
minutes, and replace or clean the filter core of
return filter. When pressure increases then,
monitor fluid temperature of the pump body and
overall proper functionality. If fluid temperature or
pump temperature are too high, flush the pump
immediately to lower the temperature, and repeat
the process.
5. After testing is complete ,make sure to set the
hydraulic pressure back to required specs per the
capacity specifications Manual.
NOTE: Unloading test must be performed, to ensure
that this device has a proper speed.
NOTE: See Figure 55 and Figure 56 for gear oil pump
structures in clockwise and counterclockwise rotations.
See Figure 57 for a diagram of hydraulic pipeline.
Hydraulic System
55