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DRAINING BRAKE SYSTEM.
To drain the brake system, connect a hose to the bleeder fitting on the bottom of the cylinder and place the other end of the line in a suitable container.  Open the bleeder and slowly pump the hand brake lever and the desired brake pedal until fluid ceases to flow.  To drain the wheel brake unit, disconnect the line at the bottom of the unit and allow fluid to flow into a suitable container.  To clean the brake system, flush with denatured alcohol.
TIRES.
The tires should be maintained at the pressure specified in Chart 601 of Chapter 6. When checking tire pressure examine the tires for wear, cuts, bruises and slippage.  The tire, tube, and wheel should be balanced when installed. Align the index mark on the tire with the index mark on the tube.
TIRE BALANCE.
Proper balancing is critical for the life of aircraft tires. If a new tire is balanced upon installation it will usually remain balanced for the life of the tire without having any shimmy or flat spots. and an inexpensive balancer can be made that will balance almost any tire for light aircraft.  Refer to Chapter 91 for balancer details. Balance the tire as follows:
1.  
Mount the tire and tube (if one is used) on the wheel, but do not install the securing bolts.  Install the wheel bearings in the wheel; then, using the -7 bushings, -6 spacers, and -5 nuts, install the wheel-tire assembly on the -8 pipe. Secure the -5 nuts finger-tight so that the wheel halves touch each other.  Be sure the bolt holes are aligned. Insert the -4 axle through the -8 pipe and place the wheel in the center of the balancer.  Make sure the axle is only on the chamfered edges of the balancer and that it is at 90° to the sides of the balancer.

2.  
Release the tire. If it is out of balance it will rotate, coming to rest with the heaviest point on the bottom. Tape a 1/2 ounce patch across top center of the tire.  Rotate the tire 45° and release it again. If the tire returns to the same position, add a 1 ounce patch and again rotate the tire and release it. Continue this procedure until the tire is balanced.

12-20-00 Page 12-16 Revised: February 28, 2002
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3.  
When balance is attained, put a chalk mark on the sidewall directly below the patch.  Use one mark for each half ounce of weight needed. Mark the valve stem location on the tire and the opposite wheel half to assure reassembly in the same position. Remove the wheel from the balance stand, break it down and clean the inside of the tire with toluol.  Apply a coat of patch cement to both the patch and the inside center of the tire in line with the chalk marks. When the cement has dried, install the patches making certain they are on the center line of the tire and aligned with the chalk marks on the sidewall.  Burnish the patches to remove trapped air, etc.

4.  
When reassembling the wheel, powder the inside of the tire.  Mount the tire on the valve side of the wheel in the same position it was in when it was balanced.  Install the other wheel half, aligning the chalk marks. Install the bolts and tighten to required torque, then air the tire and recheck the balance. The wheel should not be more than 1/ 2 ounce out of balance.

HYDRAULIC SYSTEM.
The hydraulic pump and landing gear actuating cylinders should be checked for leaks, tightness of line fittings and general condition The cylinder rods are to be free of all dirt and grit. To clean the rods, use an oil soaked rag and carefully wipe them, All the hydraulic lines should also be checked for leaks, kinks. corrosion and attachment fittings for tightness and security, Repair and check procedures for the hydraulic pump, cylinders, and various components may be found in Chapter 29.
HYDRAULIC PUMP / RESERVOIR.
The fluid level of the reservoir of the combination pump and reservoir should be checked every 50 hours by viewing the fluid through the filler plug hole in the hydraulic pump.  Access to the pump is through the panel at the rear of the baggage compartment.  To check fluid level observe the fluid level on the dipstick.  Should fluid be below the hole or the recommended level on the stick, loosen the vent screw and add fluid (See Note), MIL-H-5606, through the filler hole until full.  Reinstall the filler plug.
— Note —
The filler plug is a combination vent screw/filler plug.  To install, tighten to full tight and loosen 1 1/2 turns. These instructions are also placarded on the pump reservoir.
BATTERY.
Servicing of the battery which is through the panel of the baggage compartment, involves adding distilled water to maintain electrolyte even with the horizontal, baffles, checking cable connections, and checking for any spilled electrolyte that would lead to corrosion.  A check for proper fluid level and presence of corrosion should be conducted at intervals of 50 hours or 30 days, whichever comes first.  When corrosion is found, at each 100 hour inspection or every 90 days, the battery should be removed from the box and the battery and box should be cleaned. Removal, cleaning, and charging instructions may be found in Chapter 24.
　
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