Справочник Пользователя для Bil-Jax Wheelchair XLB-4232 DC

4. Remove headstock (2). Remove and discard o-ring (11), backup ring (12), and 

seal (13). Remove bushing (14) and wiper (15). Discard wiper. 

5. Inspect the cylinder rod (3) for scratches or pits. Pitting in the base metal is not 

acceptable. Wear indications that catch the fingernail, but do not extend into the 
base metal nor extend more than 1/2 inch along the rod length are acceptable if 
they will not cut the seal material. The chromium plating must not be worn 
through. Replace the cylinder rod if not acceptable by these inspection criteria. 

6. Inspect the headstock (2). Check the inside bore for scratches; deep scratches or 

cracks are unacceptable. Check the bore for polished wear surfaces. Polishing 
indicates uneven loading. Check the bore for out-of-roundness. If the bore is 
more than 0.007 inch out-of-round, replace the head. Seal groove damage is 
unacceptable. Replace the headstock if these conditions are not met. 

7. Inspect piston (6). Check the outside surface for scratches; deep scratches are 

unacceptable. Check the outside surface for polished wear surfaces. If polishing 
is noticed, check the piston for out-of-roundness. If out-of roundness exceeds 
0.007 inch, replace the piston. Seal groove damage is unacceptable. Replace the 
piston if these conditions are not met. 

8. Inspect cylinder housing (4) for scratches or pits. Pits or scratches that are deep 

enough to catch the fingernail are not acceptable. Scratches that catch the 
fingernail, but extend less than 1/2 inch along the tube length, are acceptable 
providing they are not sharp enough to cut the seals. Replace the cylinder tube if 
these conditions are not met. 

1.  Lubricate headstock (2, Figure 4-6), wiper (15), seal (13), backup ring (12), and 

o-ring (11) with hydraulic fluid. 

2.  Twist seal (13) into a ‘C’ shape and seat it in mating groove of headstock (2). 

3.  Seat wiper (15), backup ring (12), and o-ring (11) in mating groove of headstock 

(2). Make sure the back-up ring is installed above the o-ring. Use brass tools or 
plastic tools to avoid seal groove damage during installation. Scratching the seal 
grooves may cause by-pass leakage. Allow the assembled headstock to sit one 
hour for the seals to regain their original shape. 

4.  Lubricate piston (6) and o-rings (8 and 9) with hydraulic fluid. 

5.  Install wear ring (7). Allow the assembled cylinder head to sit one hour for the 

seals to regain their original shape. 

6.  Thoroughly rinse the inside of cylinder housing (4) with a high-pressure rinse 

and wipe with lint free cleaning cloths. 

7.  Install the headstock (2), bushing (14), stop sleeve (10), piston (6) and nut (5   ) 

onto the cylinder rod (3). Tighten the nut from 100 to 120 lb-ft (136 to 162 

N

·

m). 

8.  Apply anti-seize to the headstock threads and installed o-ring (11). 

9.  Coat the cylinder rod with hydraulic fluid and insert the rod into the cylinder 

housing. When inserting headstock (2) make sure that static o-ring (11) does not 
extrude from the o-ring groove. Be careful not to nick the seals as they enter the 
cylinder housing. 

10.  Screw headstock into the cylinder housing and tighten for a snug fit of the wiper 

(15) on the cylinder rod (3). 

11.  Press in new bearings (1).