ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
HYDRAULIC SYSTEM - CONTINUED
DERRICK WILL NOT LOWER
Step 1. Test derrick controls.
a. Engage power takeoff, start engine, and operate console controls and operator's
controls (TM 9-2320-269-10).
b. If one set of controls works properly but not the other set, shut off engine, disengage
power takeoff, and notify Direct Support Maintenance.
Shut off engine, and disengage power takeoff (TM 9-2320-269-10).
Step 2. Test elevation cylinder (2) holding valve.
a. Loosen jamnut (4), and screw in adjusting screw (5), counting number of times turned,
using 9116-inch box-end wrench and3/16-inch socket key until derrick (1) lowers.
b. If derrick (1) does not move, unscrew adjusting screw (5) the same number of times
turned in, tighten jamnut (4) using 9116-inch box-end wrench and 3/16-inch socket
key, and notify Direct Support Maintenance.