XE210C Hydraulic Excavator
Operating and Maintenance Manual
127
are found near to the connections of pipes, the air leak may occur to these connections.
c)
Check of refrigerant amount: after running the engine at 1500r/min for 1 to 3 minutes, check the
amount of refrigerant through a sight glass on the liquid reservoir.
d)
Check of condenser: if the blade of condenser is blocked by dirt or bugs, its cooling effects will be
reduced. Therefore, keep them always clean.
e)
Check of compressor: after using the air conditioner 5 to 10 minutes, touch the pipes on high- and
low-pressure sides. If they are normal, the pipe on high-pressure side shall be hot, while that on
low-pressure side shall be cold.
f)
Check the mounting bolt for loosening: ensure the mounting bolt and other mounting or tightening
bolts of compressor are well tightened.
g)
Check of belt and adjustment of tension: Check the compressor and fan belt for wears visually.
According to the above figure, check and adjust the tension of belt. The pressure of fan and
compressor belt: ca.98N, deflection: 7 to 10mm.
Check the tightening torques of bolt and nut.
Check the tightening torques of bolt and nut every 250 hours.
After the first 50 hour breaking-in period of machine, check the tightness of bolt and nut, and then
check it once every 250 hours. If loose, tighten the bolt up to the torque shown in Tightening of Bolt.
In case of replacement, replace it with the same or higher-class bolt and nut. For the bolt and nut
outside Tightening of Bolt, refer to “Tightening Torques”.
Important: check or tighten the bolt and nut with a torque wrench.
a)
Tightening Torques of Bolt
Table 2-4 Tightening of Bolt
S/N
Item
Bolt diameter
mm
Qty
Sleeve size
mm
Torque
Nm
1
Fixing bolt of engine vibration isolating
rubber gasket (pump side)
18
2
27
410
Fixing nut of engine vibration isolating rubber
gasket (fan side)
12
4
18
120
2
Fixing bolt and nut of engine bearer
10
14
16
70
3
Fixing bolt of hydraulic oil tank
18
4
27
300
4
Fixing bolt of fuel tank
16
4
24
210
5
Fixing bolt of hydraulic pump
20
4
30
600
6
Fixing bolt of multi-way valve
12
3
18
120
7
Fixing bolt of multi-way valve holder
16
4
24
210
8
Fixing bolt of rotation gear
20
13
30
600
9
Fixing nut of battery
10
2
16
50
10
Fixing nut of cab
16
4
24
210
11
Fixing bolt of
rotary bearing
(upper car)
XE210C
22
32
34
800
XE230C/XE260C
22
36
34
800
Fixing bolt of
rotary bearing
(lower car)
XE210C
20
36
30
600
XE230C/XE260C
22
36
34
800
12
Fixing bolt of traction unit
16
60
24
300
13
Fixing bolt of driving wheel
16
44
24
300
14
Fixing bolt of bearing roller
16
16
24
300
15
Fixing bolt of
bearing wheel
XE210C
18
56
~
64
27
410
XE230C
18
72
27
410
XE260C
18
72
27
410
16
Fixing bolt of
track plate
XE210C
18
368
~
376
27
410
XE230C
18
376
27
410