Raymond® Walkie Pallet Truck Maintenance Manual
Component Procedures Terminal Nuts
Terminal Nuts Whenever you disconnect and reconnect any power leads to a motor, always tighten the motor cable securing nuts with a torque wrench to prevent over-tightening them and damaging the motor. Use a second wrench on the stud terminal securing nut to avoid twisting the stud. Check these torques each time you check motor brushes. Stud Size 3/8 in. (M10) 5/16 in. (M8) 1/4 in. (M6)
Motor Cable Securing Nut 100-120 in. lbs (11.2-13.6 Nm) 90-110 in. lbs (10.2-12.4 Nm) 40-50 in. lbs (4.5-5.6 Nm)
Stud Terminal Securing Nut 140-160 in. lbs (15.8-18.1 Nm) 110-140 in. lbs (12.4-15.8 Nm) 50-60 in. lbs (5.6-6.8 Nm)
Terminal Stud Motor Cable Securing Nut
Flat Washer
Stud Terminal Securing Nut
Motor Housing
Fiber Washer
CABLENUT.eps
Figure 6-40: Motor Terminal Nuts
Electric Motor Tests Motor Types See Figure 6-41. • A shunt-wound or separately-excited motor, such as the drive motor, has four external connections: two armature (A) and two field (E).
Shunt-Wound or Separately-Excited Drive
E2 (S2)
• A series-wound motor, such as the lift motor, has only two external connections because the armature and field windings are connected internally.
Open Circuit Motor Test
E1 (S1) Series-Wound Lift Motor
An open circuit is one in which the electrical circuit within the motor has been broken. This can be caused by: • Bad brushes or brush springs • A broken wire in the field or armature winding • A loose or bad connection
Dschem.eps
Figure 6-41: Motor Circuits
PDMM-0100 Issued: 5/21/01
6-49
