3. TRAVEL MOTOR 3. TRAVEL MOTOR The followings are the general maintenance standards. However, it is the most important to determine which parts should be replaced, depending on the characteristics before disassembling, damages and discoloration of exterior view, the purpose of disassembling, the expected remaining service life. etc..
Play Method Jig for measuring play 7-21 Check item Measuring method Criteria Allowable Remedy S c Sliding surface of p cylinder block, valve plate and swash plate S - urface roughness of ylinder block, valve late and swas plate Measure the surface roughness by rough- ness tester Below 0.4 Zμ Below 3.0 Zμ Replace or repair ※ L ap together the surfaces of both cylinder block and valve plate to remedy their roughness (# 1200 power) wash plate hardness of sliding surface Measure the surface hardness of swash plate by hardness tes- ter Over HS78 HS74 Replace Clearance O between piston d and cylinder block I c d D D Measurement C position uter dia of piston max - d min Measure outer dia of piston and bore of cylinder block at least 3 places in the longitudinal direction with microme- ter and obtain :
max outer dia = d max min outer dia = d min max inner dia = D max min inner dia = D min 0.01 mm 0.05 mm Replace piston or cylinder block ※ In exchanging pistons, replace all of nine pis- t o n s a t t h e same time nner dia of ylinder bore max - D min 0.01 mm 0.022 mm learance D-d 0.037~ 0.047 mm 0.065 mm Play between pis- P ton and shoe p lay between calked iston and shoe (δ) With the jig, hold down the shoe on work stand and pull up the piston vertical direction to measure the play between piston and shoe 0~0.1 mm 0.3 mm Replace piston 34+0.2 +0.1 26 85 32 43 34 +0.2 +0.1 Magnet stand Dial gauge Piston Jig Shoe Work stand δ