52
1. pump body
2. drive gear
3. driven gear
4. front end cover
5. rear end cover
6. lining slice
7. seal
8.spacer ring
9. oil seal
10. elastic collar
11. bolt
12. washer
Figure 2-67 gear pump
(4) Commissioning
Commissioning includes running in pump by commissioning, checking running for normal, it is
better to test pump on test-bed, but testing at forklift also to be available as follows:
(if pump abrasion badly or locking attributed to hydraulic liquid and being disassembled, you
shall renew hydraulic liquid and filter before commissioning)
(a) Fit pump on forklift and fit manometer on pressure testing mouth of multiway valve.
(b) Release adjusting bolt of flooding valve to make pump run about 10 minutes by
500—1000rpm to ensure that hydraulic pressure is less than 10kg/cm².
(c) Increase rev of pump up to 1500—2000rpm about 10 minutes.
(d) Keep rev of pump between 1500—2000rpm to make pressure increase 20—30kg/cm²
once every 5 minutes until up to 175kg/cm², then, make each liquid pipeline work about 5 minutes
respectively, replace return filter.
Pay attention to temperature of liquid, of surface of pump and noise of running. If
temperature of liquid or pump surface increase too much, please reduce load to decrease
temperature of liquid,then,test again.
(e) Flooding pressure shall be 175kg/cm² after testing. Measuring flux through lift speed.
6.9 Malfunction analysis
When hydraulic system has some failure, please consult table as below to find out cause and
repair it.
Multiway valve fault diagnosis (List 2-11
）
Figure 2-11
