Check Mower Belts; Check Hydraulic System - Gravely ZT HD 48 Operator's Manual

Charge Battery
Check battery with a voltmeter. If battery is
less than 11 volts, charge battery.
NOTICE: DO NOT fast charge. Charging at a
higher rate damages or destroys the battery.
ONLY use an automatic charger designed for
use with your battery.
NOTICE: Always follow information provided
on battery by battery manufacturer. Contact
battery manufacturer for detailed information
about charging.
1. Remove battery from unit. See Remove
Battery on page 23.
2. Place battery on bench or other well-
ventilated area.
3. Connect positive lead of charger to
positive battery terminal.
4. Connect negative lead of charger to
negative battery terminal.
5. Charge battery following battery
manufacturer's instructions.
6. Reinstall battery. See Install Battery on
page 23.
Jump Starting
Gravely does not recommend jump starting
your unit. Jump-starting can damage engine
and system components. Refer to engine
manual for details.

CHECK MOWER BELTS

Check belts for wear and replace as needed.

CHECK HYDRAULIC SYSTEM

Check Hydraulic Oil Level
See Figure 24.
1. Place unit in service position. See
Service Position on page 18.
2. Check oil level in expansion tanks. Oil
should reach the cold fill indicator mark.
IMPORTANT: Engine should be cold when
checking initial oil level.
1. Cold Fill Line
2. Operate engine for 1 minute and recheck
oil levels.
3. Add hydraulic oil, if needed.
a. Remove expansion tank caps.
b. Fill expansion tanks with 15W-50
synthetic motor oil (Gravely p/n
00057100) or equivalent until oil
reaches the cold fill indicator mark.
See Figure 25.
c. Reinstall expansion tank caps.
Change Hydraulic Oil and Filter
1. Operate unit for a few minutes to warm
hydraulic oil.
2. Stop engine, remove key and wait for all
moving parts to stop and for hot parts to
cool.
3. Position container under oil filter to catch
used oil.
See Figure 25.
4. Remove filter guard and oil filter from
transaxle.
5. Remove the vent / fill plug from the fill
port and allow transaxle to drain
completely.
EN - 24
1
Figure 24