jcb JS300 Service Manual page 912

With max engine rpm's and no services selected record negative control
pressure
Select and stall boom up service record pressure
Fully select boom down record pressure when service first selected
Select and stall bucket open service record pressure
Select and stall bucket close service record pressure
Select and stall dipper open service record pressure
Select and stall arm close service record pressure
Select and stall swing left service record pressure
Select and stall swing right service record pressure
Select and stall left hand track forward record pressure
Select and stall left hand track backwards record pressure
Select and stall right hand track forwards record pressure
Select and stall right hand track backwards record pressure
* This pressure will vary with oil temperature and engine speed.
E-251
Hydraulic System Fault Finding
Test 001: Testing Negative Control Signal
Table 12.
Expected Pressures (H power band)
(30 - 35 bar*)
435 - 507 lb/in
0 - 43. 5 lb/in
435 - 507 lb/in
435 - 507 lb/in
435 - 507 lb/in
0 - 43.5 lb/in
0 - 43. 5 lb/in
0 - 43.5 lb/in
0 - 43.5 lb/in
0 - 43.5 lb/in
0 - 43.5 lb/in
435 - 507 lb/in
435 - 507 lb/in
9813/5100-1
Section E - Hydraulics
Port Pi1 Port Pi2
(30 - 35 bar*)
2 435 - 507 lb/in
(0 - 3 bar) (0 - 3 bar)
2 0 - 43.5 lb/in
(30 - 35 bar) (15 bar)
2 217.5 lb/in
(30 - 35 bar) (0 - 3 bar)
2
0 - 43.5 lb/in
(30 - 35 bar) (0 - 3 bar)
2 0 - 43.5 lb/in
(0 - 3 bar) (0 - 3 bar)
2 0 - 43.5 lb/in
(0 - 3 bar) (0 - 3 bar)
2 0 - 43.5 lb/in
(0 - 3 bar) (30 - 35 bar)
2 435 - 507 lb/in
(0 - 3 bar) (30 - 35 bar)
2 435 - 507 lb/in
(0 - 3 bar) (30 - 35 bar)
2 435 - 507 lb/in
(0 - 3 bar) (30 - 35 bar)
2
435 - 507 lb/in
(30 - 35 bar) (0 - 3 bar)
2 0 - 43.5 lb/in
(30 - 35 bar) (0 - 3 bar)
2 0 - 43.5 lb/in
2
2
2
2
2
2
2
2
2
2
2
2
2
E-251