TM 10-3930-664-24 Table 2-1.  Unit Preventive Maintenance Checks and Services (cont) Item Item to Not Fully Mission No. Interval Check/ Service Procedure Capable If: 5 MAST ASSY 50 Hours a Carriage Service carriage tilt cylinder Cylinder is Tilt (para 2-152) Inspect for  damaged. Cylinder damage or evidence of leakage. Replace as required (para 2-153). 50 Hours b Carriage Service carriage assembly Assembly (para 2-154). 50 Hours c Mast Assy Service mast assembly (para. 2-156). Quarterly d Wear Pads Inspect wear pads for uneven Semi-circle is or excessive wear.  Check for worn away. small semi-circle on face of pad.  Replace as required (para 4-41). 6 Semi- DRIVE SHAFTS Service drive shafts (para Drive shaft annually 2-98) Inspect and repair is damaged. as required (para 2-100). 7 Semi- AXLES Service front and rear axles Axle is annually (para 2-102, 2-104) damaged. Inspect for damage or evid- ence of leakage (para 2-101, 2-103). 8 250 Hours TRANSMISSION Check condition of trans- Filter shows mission fluid.  If color is signs of trans- dark and smells burned, mission damage, change fluid (para 2-93) ie; rust or and replace filter metal chips. (para 2-96). Annually Test transmission operation Transmission (para 2-94) fails tests. 2-8