45
12 Maintenance and servicing
12.7 Screw connections
Checkboltsandnutsforthersttimeaftervehoursofoperationand
thentightenthemregularly(every50hoursofoperation).
• AlltorquesMAarestandardvaluesformetricstandardthreadsaccor-
dingtoDIN.Frictioncoecient0.14-newbolts-unlubricated.The
valueswererecommendedasguidevaluesbydierentboltmanufac-
turers.Wecannotassumeliabilityforuse.
• Self-lockingnutsmustbereplacedaftereachdismantling.
12.8 Fuse replacement
Themachineisprotectedbyafuse.
ThefuseslotontheWR870Battery
islocatedonthehandleinthe
switchhousing.
60Amperefuse
(Fig. 26 - Fuse)
Thread 3.6 5.6 6.8 8.8 10.9 12.9
M6 3.43 4.51 8.73 10.3 14.71 17.65
M8 8.24 10.79 21.57 25.50 35.30 42.17
M10 16.67 21.57 42.17 50.01 70.61 85.32
M12 28.44 38.25 73.55 87.28 122.58 147.10
M14 45.11 60.80 116.70 135.27 194.17 235.36
M16 69.63 93.16 178.46 210.84 299.10 357.94
M18 95.13 127.40 245.17 289.30 411.88 490.34
M20 135.33 180.44 348.14 411.88 576.50 669.26
M22 162.40 245.17 470.72 558.98 784.45 941.44
Torque MA